Question 1

i get a burst of air or sputtering water every time i first open the apec faucet

Accepted Answer

DIAGNOSIS The sputtering or "burping" effect experienced with the APEC ROES-50 is caused by trapped air pockets residing in the delivery line between the pressurized storage tank and the RO faucet. This typically occurs because the system is a closed-loop pressurized environment; when you replace the pre-filters or the membrane, air enters the housing. If the system sits idle for several days, small amounts of dissolved gases can also coalesce into larger bubbles that migrate toward the highest point of the plumbing—usually the faucet or the top of the storage tank. You can confirm this is an air-lock issue rather than a mechanical failure by observing the flow rate. If the water comes out in a violent, erratic spray for 3-5 seconds and then settles into a steady, strong stream, it is simply trapped air. However, if the sputtering is accompanied by a very weak flow that never recovers, you likely have a depleted bladder in the storage tank or a kink in the 1/4" LLDPE tubing. In most cases with the ROES-50, this is a benign byproduct of the system's design and the physics of air displacement in narrow-bore tubing. FIX To properly purge the system and eliminate the air pockets, follow these steps to ensure all gas is evacuated from the line and the tank is properly primed: Close the cold water supply valve leading to the RO system to prevent new water from entering the pre-filters during the initial purge. Open the RO faucet fully. Let the water run until the flow stops completely. This empties the current pressurized volume of the tank. Slowly open the main cold water supply valve. This forces new water through the 5 stages and into the tank, pushing existing air pockets forward. Wait approximately 20 minutes for the tank to begin refilling. You will hear the water rushing into the tank. Open the RO faucet again. You will likely experience the sputtering burst. Do not close the faucet; let it run for a full 60 to 90 seconds. Use a pitcher to catch the water to avoid splashing your countertops. While the water is running, gently shake or wiggle the 1/4" tubing leading from the tank to the faucet. This helps dislodge air bubbles clinging to the inner walls of the tubing. Close the faucet and allow the system to reach full pressure (usually 2-4 hours). Perform one final "flush" by opening the faucet for 10 seconds to clear any remaining micro-bubbles. IF THAT DIDN'T WORK If the sputtering persists after a full purge, try these advanced troubleshooting steps: Check the Tank Pressure: Use a low-pressure tire gauge to check the air valve (Schrader valve) at the bottom or side of the storage tank. With the tank empty of water, it should read between 7 and 10 PSI. If it is significantly higher or lower, the air-to-water ratio is off, which can cause erratic discharge. Adjust the pressure using a handheld bike pump. Inspect for "Air Leaks" on the Suction Side: Check the push-fit connectors on the pre-filters. If a fitting is slightly loose, it may not leak water out, but it can allow air to be sucked into the line via Venturi effect, creating a constant stream of bubbles. Push the tubing firmly into the fitting until it seats against the internal stop. Reset the Tank Orientation: If the tank was accidentally tilted during installation, air can trap in the top dome. Ensure the tank is standing perfectly vertical. If possible, slightly loosen the tank valve for 2 seconds to let a "burp" of air escape, then tighten it immediately. Replace the Post-Carbon Filter: If you recently installed a new final stage (the horizontal polished carbon filter), it may contain trapped air in the carbon media. Remove the filter, reinstall it, and run the water for 5 minutes to fully saturate the carbon block. HEADS UP Avoid Over-Pressurizing: Never pump the storage tank above 12 PSI when empty; doing so can collapse the internal bladder and permanently ruin the tank. Filter Change Protocol: Whenever you change the ROES-50 filters, always run the water for 10 minutes before drinking to flush out carbon fines and air. Tubing Kinks: Ensure the 1/4" tubing has wide, sweeping curves. Tight bends can create "air traps" where bubbles collect and cause the sputtering you are experiencing. Leak Check: After purging air, always run your finger around the push-fit connections to ensure no drips developed due to the increased vibration of the sputtering water.

Question 2

my water pressure is fine but the ro system seems to produce water super slow

Accepted Answer

DIAGNOSIS The APEC ROES-50 is a high-capacity system, but its production rate is entirely dependent on the osmotic pressure differential across the membrane. When you experience a "trickle" at the faucet despite having strong household water pressure, the root cause is typically a significant pressure drop occurring *before* the water reaches the TFC (Thin Film Composite) membrane. If the first three pre-filters (sediment and dual carbon) are saturated, they create a physical bottleneck that restricts the flow rate, meaning the membrane never receives the 50-80 PSI required to force water through the microscopic pores. Another common culprit is "membrane fouling" or scaling. Over time, minerals like calcium and magnesium precipitate out of the water and form a hard crust on the membrane surface. This creates a physical barrier that slows production to a crawl. You can confirm this by checking the storage tank pressure; if the tank is nearly empty but the system isn't actively filling (you don't hear the constant hiss of the drain line), the membrane is likely fouled. Conversely, if the tank is full but the water flows slowly from the faucet, the issue is not production, but a loss of air pressure in the tank's internal bladder. FIX To restore full production speed, follow these precise steps to clear the flow path and reset the system pressure: Perform a Filter Swap: Shut off the cold water supply valve and open the RO faucet to relieve pressure. Use the provided housing wrench to unscrew the first three canisters. Replace the 5-micron sediment filter and both carbon blocks. Ensure the O-rings are lubricated with a food-grade silicone grease to prevent air leaks, which can cause "air lock" and slow production. Inspect the Membrane: Carefully unscrew the fourth housing (the membrane housing). Pull out the RO membrane. Inspect the seal; if there is a buildup of slime or white crystalline scale on the membrane's outer wrap, it needs replacement. Insert a new membrane and push firmly until you feel it "click" into the seat. Verify Tank Pressure: Locate the air valve (Schrader valve) on the bottom or side of the storage tank. Use a low-pressure gauge to check the air charge. With the tank empty of water, the pressure should be exactly 7-10 PSI. If it is lower, use a bicycle pump to add air. If the pressure is too high, the bladder will compress the water, preventing it from flowing efficiently to the faucet. Flush the System: After replacing filters, leave the storage tank valve closed and run the faucet for 5 minutes. This clears any carbon fines or air bubbles that could be obstructing the flow path. IF THAT DIDN'T WORK Check the Auto Shut-Off Valve (ASO): The ASO valve is the small four-way valve located near the membrane. If the internal diaphragm is stuck or malfunctioning, it may be prematurely shutting off the feed water even when the tank is empty, leading to a slow drip rather than a steady flow. Replace the ASO valve if you hear the system "clicking" or cycling rapidly. Test for Feed Water Temperature: If your intake water is coming from a crawlspace or exterior line during winter and is below 45°F, the water viscosity increases. This can reduce the ROES-50's output by up to 50%. Insulate the feed line or install a point-of-entry heater to restore production speeds. Replace the Flow Restrictor: The flow restrictor on the waste line controls how much water is pushed through the membrane. If the restrictor is clogged with debris, it can create backpressure that disrupts the osmotic process. Replace the restrictor with a genuine APEC 300ml/min part to ensure the correct waste-to-pure water ratio. Inspect the Faucet Aerator: It sounds simple, but the ROES-50 faucet has a very fine aerator. Mineral buildup in the tip of the faucet can mimic a slow production problem. Unscrew the aerator tip and clean it with white vinegar for 30 minutes. HEADS UP Filter Schedule: To prevent production drops, replace the first three pre-filters every 6 months and the membrane every 24 months, regardless of perceived water quality. Avoid Kinking: Ensure the 1/4" polyethylene tubing is not bent at a 90-degree angle anywhere in the installation. A single kink can drop the pressure by 15 PSI, which drastically slows the RO process. Sanitization: Whenever you replace the membrane, add a small amount of unscented bleach or a sanitizing solution to the first stage housing to prevent biofilm buildup, which can clog the membrane from the inside out. Tank Priming: Always check your tank air pressure *before* filling it with water. Adding air to a tank already full of water will not work and can lead to inaccurate readings.

Question 3

the faucet on my apec system is leaking around the base where it meets the counter

Accepted Answer

DIAGNOSIS This leak is almost always caused by a failure of the mechanical seal between the faucet body and the countertop surface, rather than a failure of the internal RO plumbing. In the APEC ROES-50 system, the faucet is secured by a plastic mounting nut and a rubber gasket. Over time, the vibration from the water hammer or the physical pressure of turning the handle can cause the mounting nut to back off, creating a gap between the gasket and the counter. When this gap exists, water from the sink basin or splashes from the faucet migrate downward through the hole in the countertop. Because the seal is compromised, the water doesn't stay on top of the counter; it seeps through the mounting hole and drips onto the cabinet floor. You can confirm this by drying the area completely and then pouring a small amount of water around the base of the faucet on the countertop; if water immediately appears under the sink, the seal is the culprit. If water only leaks when the faucet is running, you may have a hairline crack in the faucet body or a loose connection at the base of the stem. FIX To resolve this leak and secure the faucet, follow these precise steps: Clear out all items from under the sink to ensure you have full access to the underside of the countertop. Use a flashlight to locate the large plastic mounting nut (usually white or translucent) that secures the faucet to the counter. From above the counter, have a partner hold the faucet perfectly vertical and centered to prevent it from rotating while you work. Reach under the counter and rotate the mounting nut clockwise. Use your hand first; if it is stuck, use a pair of large slip-joint pliers, but be careful not to crack the plastic. Tighten the nut until it is snug. Stop immediately once you feel firm resistance. Overtightening can warp the rubber gasket or crack the plastic nut, which will actually create a new leak path. Wipe the base of the faucet and the underside of the counter dry with a microfiber cloth. Run the faucet for 60 seconds and check the underside of the counter for any new moisture. IF THAT DIDN'T WORK Replace the Rubber Gasket: If the nut is tight but water still seeps through, the rubber gasket has likely perished or shifted. You will need to unscrew the mounting nut completely, lift the faucet out of the hole, and inspect the black rubber washer. If it is flattened or cracked, replace it with a standard 1/2-inch RO faucet gasket. Ensure the counter surface is perfectly clean of debris before reseating the faucet. Apply Food-Grade Silicone: For counters with uneven surfaces (like some granite or concrete installs), the rubber gasket may not make full contact. Apply a small bead of food-grade clear silicone sealant around the top rim of the faucet base before pressing it into the counter. This creates a waterproof barrier that prevents surface water from entering the mounting hole. Inspect the Faucet Stem: If the leak is originating from *inside* the faucet body and dripping down the base, the internal O-ring in the faucet handle may be worn. Remove the small set screw on the handle, pull the handle off, and check for moisture on the stem. If the stem is leaking, the entire faucet assembly should be replaced as these are typically non-serviceable units. Check the Tubing Connection: Ensure the 1/4" LLDPE tubing is pushed firmly into the faucet's bottom connection. If the tubing is slightly loose, water can spray upward against the bottom of the counter and mimic a base leak. Push the tube in firmly until it seats fully against the stop. HEADS UP Never use a power drill or impact driver to tighten the plastic mounting nut; the torque will strip the threads instantly. Periodically check the mounting nut every 6 months, as the constant motion of the faucet handle can slowly loosen the hardware over time. If you have a stone countertop, avoid using harsh chemical cleaners around the faucet base, as they can degrade the rubber gasket faster than standard soap and water. Always keep a drip tray or a plastic liner in the bottom of your RO cabinet to prevent undetected leaks from causing permanent water damage to your cabinetry.

Question 4

there's a puddle of water under my apec roes-50, how do i find the leak?

Accepted Answer

DIAGNOSIS A puddle beneath an APEC ROES-50 is typically caused by a failure in one of three areas: the O-ring seals in the three primary pre-filter sumps, the push-fit (Quick Connect) tubing couplings, or a hairline crack in the plastic housing due to over-tightening. Because the ROES-50 uses a high-pressure feed, a leak may start as a slow "weeping" drip that saturates the base of the unit, making it appear as a general puddle rather than a distinct stream. This is often exacerbated by vibration or thermal expansion and contraction of the polyethylene tubing. To confirm the source, you must isolate the pressure zones. If the puddle appears immediately after a filter change, the culprit is almost always a pinched or dry O-ring in the sediment or carbon housings. If the leak is intermittent, it is likely a failure in the automatic shut-off valve (ASO V) or a loose fitting on the storage tank line. Check for "salt crusting" or white mineral deposits around the fittings; these deposits act as a map, pointing directly to the point of egress even after the water has dried. FIX Shut off the cold water supply valve and open the RO faucet to bleed off all remaining pressure from the system. Use a microfiber cloth to completely dry every inch of the system, including the bottom of the filter housings and the undersides of the tubing. Slowly open the supply valve and use a dry piece of toilet paper or a paper towel to "blot" every connection point. Paper towels are superior to your eyes for detecting micro-leaks because they change color instantly when damp. Check the Sump Housings: If the leak is coming from the top of a canister, use the provided housing wrench to snug the canister. Do not over-tighten; a 1/4 turn is usually sufficient. If it still leaks, unscrew the housing, remove the O-ring, lubricate it with a food-grade silicone lubricant, and reseat it perfectly flat. Inspect Quick-Connect Fittings: Locate the white push-fit connectors. If you see moisture, push the tubing firmly into the fitting. The tubing must be inserted fully past the internal collet to create a seal. If the tubing was cut at an angle instead of a clean 90-degree square cut, it will leak; cut the tube square and re-insert. Verify the ASO Valve: Check the four-way shut-off valve (the square block). Ensure the tubing is seated deep in the ports. If water is dripping from the valve body itself, the internal diaphragm has failed and the valve must be replaced. IF THAT DIDN'T WORK Replace the O-Rings: Over time, the rubber seals in the ROES-50 sumps can flatten or crack. Replace the O-rings with a high-quality Buna-N or EPDM equivalent. Ensure no debris or old rubber fragments remain in the groove before installing the new seal. Trim the Tubing: If a push-fit connection continues to leak despite being pushed in, the end of the tubing may have developed a "burr" or a deformation from the previous seal. Cut 1/2 inch off the end of the tube using a sharp utility knife (not scissors, which crush the tube) and re-insert. Check for Housing Stress Cracks: Inspect the plastic sumps for vertical hairline cracks. This often happens if the wrench was applied with too much torque. If a crack is found in the plastic, the entire housing must be replaced; epoxy or tape will not hold under the 60-100 PSI of a home water line. Inspect the Tank Valve: If the leak is near the storage tank, the tank's ball valve or the tubing connection to the tank may be failing. Replace the tank valve or the tubing section leading to the tank to eliminate this as a source. HEADS UP Never use Teflon tape on the threads of the filter housings; the seal is created by the O-ring, not the threads. Tape can actually prevent the housing from seating deeply enough to compress the O-ring. Always use food-grade silicone grease on O-rings. Never use petroleum jelly (Vaseline), as it can degrade the rubber and contaminate your drinking water. Ensure the system is mounted securely. If the unit sways or vibrates during the filtration process, it can loosen the push-fit connections over time. Periodically check the drain line (the black tube going to the sink drain). If this line becomes kinked or clogged, back-pressure can build up and force water out of the weakest connection point in the system.

Question 5

my apec ro system tank seems to have low pressure, water just dribbles out of the faucet

Accepted Answer

DIAGNOSIS The APEC ROES-50 utilizes a pressurized diaphragm tank to store purified water. Inside the tank, a rubber bladder separates the stored water from a pocket of compressed air. This air acts as a spring; as the RO membrane slowly fills the tank, the air compresses, creating the pressure necessary to push water up through the faucet when you open the valve. When you experience a "dribble" despite the tank feeling heavy with water, it indicates a loss of this air pre-charge. This pressure loss typically occurs due to microscopic leaks around the Schrader valve or gradual permeation through the bladder material over several years. To confirm this is the issue, lift the tank. If the tank feels heavy (indicating it is full of water) but only a small amount of water flows out before the pressure drops to nothing, the air bladder has lost its charge. If the tank is light and empty, the issue is likely a fouled membrane or a closed feed valve rather than a tank pressure problem. FIX To restore the pressure in your APEC ROES-50 storage tank, you will need a standard bicycle pump or a small automotive compressor with a pressure gauge. Close the cold water feed valve located at the wall or under the sink to stop new water from entering the system. Open the RO faucet and let all the water drain out completely. This is critical; if you add air while the tank is full of water, you will create a "hydraulic lock" and cannot get an accurate pressure reading. Locate the air valve (Schrader valve) on the side or bottom of the blue tank. Remove the plastic protective cap. Attach your pressure gauge to the valve. A completely depleted tank will read 0 PSI. Slowly add air into the tank. Use short bursts to avoid overheating the valve. Pump the tank until the gauge reads exactly 7 to 8 PSI. Do not exceed 10 PSI, as over-pressurizing can rupture the internal bladder or prevent the RO membrane from filling the tank. Remove the gauge and replace the plastic cap securely. Close the RO faucet and reopen the cold water feed valve. Allow the system to fill completely (this may take 2-4 hours depending on your water temperature and TDS levels) before testing the flow at the faucet. IF THAT DIDN'T WORK Check for a Ruptured Bladder: Depress the small pin inside the Schrader valve briefly. If water squirts out of the air valve instead of air, the internal rubber bladder has ruptured. This is a non-repairable failure. You must replace the entire storage tank (Part number: APEC-TANK). Inspect the Auto Shut-Off Valve (ASO): If the tank remains empty even after recharging, the ASO valve may be stuck. This valve shuts off the water supply once the tank reaches pressure. If it fails in the "closed" position, the tank will never refill. Tap the ASO valve gently with a screwdriver handle to see if flow resumes. Test the RO Membrane: If the tank is empty and the ASO is working, your membrane may be fouled. Place a graduated cylinder under the waste water line. If the waste line is flowing but the tank isn't filling, the membrane is likely exhausted and needs replacement (Model: Dow Filmtec or APEC equivalent). Verify Feed Water Pressure: Ensure your home's incoming water pressure is at least 40 PSI. If your home pressure is too low, the ROES-50 cannot overcome the osmotic pressure required to push water into the storage tank. HEADS UP Pressure Maintenance: Check your tank air pressure once every 12 months. It is common for these tanks to lose 1-2 PSI per year. Avoid Over-inflation: Never use a high-pressure air compressor without a regulator. Pumping a tank to 30 or 40 PSI will permanently damage the bladder and significantly reduce your usable water capacity. Sanitization: Whenever you open the system or replace the tank, it is highly recommended to sanitize the lines using a diluted bleach solution or a specialized RO sanitizing kit to prevent biofilm buildup. Temperature Effects: In winter months, your RO system will produce water significantly slower. If you notice a slight dip in pressure during January or February, it may be due to water temperature rather than a leak.

Question 6

the water from my apec system tastes weird or has a bad odor after i changed the filters

Accepted Answer

DIAGNOSIS The strange taste or "chemical" odor following a filter change on the APEC ROES-50 is typically caused by "carbon fines." The pre-filters and the post-carbon polishing filter contain activated carbon in granular or block form. During shipping and installation, tiny particles of carbon dust break off. If these particles enter the membrane or the storage tank, they can impart a metallic or bitter taste to the water. Additionally, new filter cartridges introduce air pockets into the system. As water pushes through these pockets, it can create micro-bubbles that alter the surface tension and taste of the water, or trap organic compounds that were sitting in the lines. If you smell a "sulfur" or "plastic" scent, it is often the result of the new filter materials reacting with stagnant water in the lines or the RO membrane being momentarily exposed to air during the swap. You can confirm this by taking a sample of water directly from the RO membrane output (before it hits the tank); if that tastes fine but the faucet water tastes bad, the issue is localized in the storage tank or the final polishing stage. FIX To eliminate these contaminants, you must perform a full system purge. Do not simply run a few glasses of water; you must bypass the storage tank to ensure the new filters are fully saturated and flushed. Close the blue valve on top of the pressurized storage tank by turning it 90 degrees to the "off" position. Open the RO faucet on your countertop and let the water flow. Because the tank is closed, the flow will be a very slow trickle. This is normal. Allow this trickle to run for 15 to 20 minutes. This forces water through the new sediment and carbon pre-filters, flushing the carbon fines directly into the drain line rather than into your drinking water. Close the RO faucet. Open the storage tank valve slowly to allow the system to refill. Wait for the tank to fill completely (usually 2-4 hours depending on your water pressure). Once full, open the RO faucet and drain the entire tank completely. You will notice the flow is fast at first and then slows down. Repeat the tank drain process one more time. This ensures that any carbon dust that migrated into the tank during the initial refill is completely purged. IF THAT DIDN'T WORK Check the Post-Carbon Filter Installation: Ensure the final stage polishing filter (the horizontal one before the faucet) is seated perfectly. If the O-rings are pinched or skewed, air can leak into the line, causing a "stale" taste. Remove the filter, lubricate the O-rings with a tiny drop of food-grade silicone grease, and re-insert it firmly. Sanitize the Storage Tank: If the odor persists, the storage tank may have developed a biofilm or trapped air during the downtime of the filter change. Add a teaspoon of unscented household bleach to the tank via the top port (if accessible) or simply drain and refill the tank three consecutive times to "scrub" the interior bladder. Verify Membrane Seal: If the taste is salty or brackish, the RO membrane may have been damaged or shifted during the filter change. Check the membrane housing for leaks. If the TDS (Total Dissolved Solids) reading is significantly higher than usual, the membrane may need replacement. Inspect for "Cross-Contamination": Ensure that the tubing from the pre-filters is not touching any non-food-grade surfaces or that no lubricant was used on the filter housings that could have leaked into the water stream. HEADS UP Always replace the sediment filter (Stage 1) every 6 months to prevent debris from clogging the carbon blocks, which can lead to "channeling" and poor taste. When installing new filters, always ensure the housings are tightened by hand first, then give them a quarter-turn with the wrench. Over-tightening can crack the plastic housings or deform the seals. If you have high chlorine levels in your municipal water, the carbon filters will saturate faster. If the taste returns prematurely, consider adding a second carbon pre-filter. Never use petroleum-based lubricants on the O-rings of the ROES-50 system, as these will leach chemicals into your drinking water and cause a permanent chemical taste.

Question 7

just installed my apec roes-50 and the tank won't fill up at all, zero water coming out

Accepted Answer

DIAGNOSIS When a newly installed APEC ROES-50 fails to fill the storage tank, the primary culprit is almost always an "air lock" within the membrane housing or a failure to properly initiate the flow through the check valve. Because the ROES-50 uses a high-pressure membrane, air bubbles can become trapped in the upper dome of the housing, creating a pocket of resistance that prevents water from reaching the permeate tube (the small line leading to the tank). If the air pressure is high enough, it effectively blocks the water from entering the membrane, meaning the system will simply send all water down the drain line without any filling the tank. Another common cause is a stuck or improperly seated one-way check valve. This valve is located at the exit of the membrane housing; its job is to prevent water already in the tank from flowing backward through the membrane. If this valve is stuck closed or if the tubing is kinked at the connection point, the water cannot move forward into the storage tank. You can confirm this by checking the drain line: if water is constantly flowing to the drain but the tank remains empty after 4-6 hours, you have a flow blockage or an air lock rather than a leak. FIX To resolve an air lock and prime the ROES-50 system, follow these precise steps: Close the cold water feed valve and the blue storage tank valve (turn clockwise until tight). Open the RO faucet on your sink and leave it open; this relieves the internal pressure. Locate the tubing that enters the membrane housing (the largest horizontal canister). Carefully disconnect the tubing from the "Inlet" port of the membrane housing. Place the end of this tubing into a plastic bucket. Slowly open the cold water feed valve. You will see water flow into the bucket. This process pushes the trapped air out of the pre-filters and ensures the membrane inlet is fully primed with water. Once the water flow is steady and bubble-free, reconnect the tubing to the membrane housing inlet, ensuring the push-fit connector is seated fully (push it in until you feel a second "click"). Close the RO faucet and open the blue storage tank valve. Wait 3 to 5 hours. The tank will not fill instantly; it typically takes several full cycles to reach the 2.0 to 3.0 gallon capacity. IF THAT DIDN'T WORK Check the Automatic Shut-Off Valve (ASO): The four-way valve (where four tubes meet) may be malfunctioning. If the internal diaphragm is stuck, it may be signaling the system to stop producing water even when the tank is empty. Gently tap the side of the ASO valve with a plastic screwdriver handle to see if it releases. Inspect the Check Valve: Remove the small plastic check valve located at the membrane housing outlet. Try blowing air through it; if you cannot blow air in the direction of the tank, the valve is defective and must be replaced. Verify Feed Water Pressure: Use a pressure gauge on your main line. The ROES-50 requires a minimum of 40 PSI to function. If your home pressure is below 40 PSI, the water will not have enough force to overcome the osmotic pressure of the membrane, and the tank will never fill. Check for Kinked Tubing: Examine the 1/4" poly tubing, specifically where it enters the tank and the membrane housing. Even a slight pinch in the line can restrict flow enough to prevent the tank from pressurizing. HEADS UP Initial Flush: Always discard the first two full tanks of water. The ROES-50 membrane contains a food-grade preservative that must be flushed out before drinking. Leak Check: After priming the system, apply a small amount of soapy water to every push-fit connection. If you see growing bubbles, the tubing isn't cut square or isn't pushed in far enough. Tank Pressure: If the tank feels heavy but no water comes out of the faucet, the air bladder in the tank may have lost pressure. Use a tire gauge to check the valve (usually located at the bottom of the tank); it should be between 5 and 7 PSI when empty. Filter Replacement: Change the first three pre-filters every 6 months to prevent sediment from clogging the membrane, which would lead to the same "no fill" symptom.

Question 8

my apec roes-50 system is making a constant hissing sound from the drain line, is that normal?

Accepted Answer

DIAGNOSIS The constant hissing sound emanating from the drain line of your APEC ROES-50 indicates that the system is stuck in a continuous production cycle. In a healthy RO system, water flows to the drain only while the storage tank is filling. Once the tank reaches full capacity, the internal pressure triggers the Auto Shut-Off (ASO) valve to clamp down on the feed water, stopping the flow. If you hear a non-stop hiss, the ASO valve is failing to close, meaning your system is wasting gallons of water per hour and potentially over-pressurizing the storage tank. This failure typically occurs due to one of three reasons: a lack of sufficient incoming water pressure to trigger the valve, a mechanical failure (debris or a torn diaphragm) inside the ASO valve, or a faulty check valve located at the outlet of the membrane housing. If the check valve fails, water leaks back from the membrane into the system, tricking the ASO valve into thinking the tank isn't full, which keeps the drain line open indefinitely. You can confirm this by closing the blue storage tank valve; if the hissing continues for more than 15-20 minutes after the tank is closed, the ASO valve or check valve is definitely compromised. FIX To resolve the continuous drain flow, follow these steps to isolate and replace the failing components: Shut off the main cold water supply valve and open the RO faucet to bleed off all remaining pressure in the lines. Locate the ASO valve, which is the small square plastic component with four tubing connections located near the pre-filter housings. Disconnect the 1/4" LLDPE tubing from the ASO valve by pushing in the locking clips and pulling the lines. Inspect the tubing for any kinks or sediment buildup that might be preventing pressure from reaching the valve. Replace the ASO valve with a new genuine APEC replacement part. Ensure the tubing is pushed firmly into the quick-connect fittings until you feel a "click" or a seat, as a partial seal can cause pressure leaks that prevent the valve from shutting off. If the hissing persists after replacing the ASO, you must replace the membrane check valve. This is the small elbow fitting located where the permeate (clean water) line exits the membrane housing. Remove the old elbow and install a new one, ensuring the directional arrow points toward the storage tank and faucet. Slowly turn the water supply back on and monitor the drain line. The hissing should stop once the storage tank reaches approximately 30-40 PSI. IF THAT DIDN'T WORK Verify Incoming Water Pressure: Use a standard pressure gauge on your cold water line. The ROES-50 requires a minimum of 40 PSI to function correctly. If your home pressure is below 40 PSI, the ASO valve will never receive enough force to snap shut. In this case, you must install an inline permeate booster pump to artificially increase the pressure to the membrane. Check for Storage Tank Air Bladder Failure: If the tank's internal bladder has ruptured, the tank cannot hold the backpressure required to trigger the ASO valve. Press the air valve (Schrader valve) on the bottom of the tank. If water squirts out of the air valve, the tank is compromised and must be replaced immediately. Inspect the Membrane for Fouling: If the RO membrane is severely scaled or clogged, it may not produce water fast enough to build the necessary pressure to close the ASO valve. If your membrane is more than 24 months old, replace it with a new TF RO membrane. Clear the Flow Restrictor: Check the drain line flow restrictor (the small plastic plug in the waste line). If it is completely blocked, it can cause erratic pressure swings that prevent the ASO valve from seating properly. Replace the flow restrictor if it shows signs of mineral buildup. HEADS UP Avoid Over-Pressurizing: Never leave a failing ASO valve running for days; this can lead to the storage tank overfilling, which may cause the tank to leak or the safety relief valve to trigger. Sanitization Cycle: Whenever you open the system to replace the ASO or check valve, it is a best practice to sanitize the housings using a mild bleach solution to prevent bacterial growth in the stagnant areas of the plumbing. Tubing Cuts: When replacing valves, always use a sharp utility knife or specialized tubing cutter to make perfectly square cuts. Angled cuts in the 1/4" tubing often lead to slow leaks at the ASO valve connections. Filter Schedule: To prevent debris from clogging the ASO valve, replace your three pre-filters every 6 months. Sediment buildup in the first stage is the leading cause of pressure drops that cause ASO failure.

APEC ROES-50 5-Stage Reverse Osmosis System

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