changed the filters now it's leaking from the bottom of the filter housings, just a slow drip.

Diagnosis

The slow drip from the bottom of the Frizzlife PD600-TAM3 filter housings typically indicates a failure in the primary seal between the filter cartridge and the housing wall. In this specific model, the seal relies on a precise fit of the O-ring located at the top of the filter element. If the filter was not inserted perfectly perpendicular to the housing, or if the O-ring shifted during the insertion process, a microscopic gap is created. Because the PD600-TAM3 operates under significant pressure to push water through the RO membrane, even a hairline gap will result in a persistent, slow drip. Another common cause is the presence of "debris interference." During the filter change, a small piece of sediment, a grain of sand, or a stray piece of plastic shaving from the filter packaging can get trapped on the seating surface of the housing. This prevents the O-ring from compressing fully against the plastic wall. You can confirm this by drying the exterior of the unit completely with a paper towel and wrapping a dry tissue around the base of the housing; if the tissue dampens at the very bottom seam, the seal is compromised.

How to Fix It

Follow these exact steps to reseal the housing and stop the leak:

1. Shut off the cold water supply valve feeding the system and unplug the power adapter from the wall outlet to kill all pump pressure.
2. Open the faucet to release any residual pressure trapped in the lines.
3. Using the provided housing wrench, carefully unscrew the leaking filter canister by turning it counter-clockwise.
4. Remove the filter cartridge and inspect the black rubber O-ring at the top. Check for any nicks, tears, or "flattening" of the ring. If it is twisted or out of its groove, gently push it back into place with your fingernail.
5. Use a clean, lint-free microfiber cloth to wipe the inner rim of the housing and the groove where the O-ring seats. Ensure there is no grit or slime remaining.
6. Apply a tiny amount of food-grade silicone grease (do not use petroleum jelly/Vaseline as it degrades the rubber) to the O-ring. This allows the ring to glide into place without pinching.
7. Insert the filter cartridge straight down. Do not rock it side-to-side; apply firm, even downward pressure to ensure it is fully seated.
8. Screw the housing back on by hand first to avoid cross-threading. Once hand-tight, use the wrench to give it an additional 1/4 turn. Do not over-tighten, as this can warp the plastic housing and actually cause a leak.
9. Slowly turn the water supply back on and observe the seam for 5 minutes before plugging the unit back in.

If That Didn't Work

• Check for Hairline Cracks: Inspect the bottom of the plastic housing for "stress fractures." If the housing was over-tightened in the past, a microscopic crack may have developed. If you see a vertical line that doesn't look like a mold seam, the housing must be replaced.
• Verify O-Ring Diameter: If you are using a third-party replacement filter, the O-ring diameter may be off by a fraction of a millimeter. Compare the O-ring of the leaking filter with a known-good Frizzlife original; if it is thinner, it will not create a pressurized seal.
• Inspect the Housing Gasket: Some versions of the PD600 have a secondary gasket between the housing and the manifold head. Remove the filter entirely and check if this flat gasket is pinched or skewed. Reposition it and ensure it is lying perfectly flat.
• Pressure Regulator Check: If the leak only happens when the pump kicks in, your incoming water pressure may be too high, causing "blow-by" at the seal. Install a pressure-reducing valve (PRV) on the feed line to keep pressure below 80 PSI.

Heads Up

• Avoid Over-Tightening: The most common cause of permanent housing failure is using a wrench to "crush" the seal. Hand-tight plus a quarter turn is the gold standard for RO housings.
• Silicone Only: Never use WD-40 or petroleum-based lubricants on these O-rings; they cause the rubber to swell and eventually rupture, leading to a catastrophic flood.
• Flush Before Use: After fixing a leak and replacing filters, always run the system for 10-15 minutes (or two full tank refills) to clear any air pockets and lubricant residue before drinking.
• Dry Storage: Keep your spare filters in a cool, dry place. If the rubber O-rings are exposed to extreme heat or direct sunlight in storage, they can lose their elasticity and fail upon installation.