the water from my aquatru doesn't seem cold enough. how do i make it colder?

Diagnosis

The AquaTru Glass Carafe system is a countertop reverse osmosis unit, not a dedicated refrigeration appliance. A common misconception is that the unit contains a high-powered cooling compressor similar to a refrigerator. In reality, the "chilling" effect is primarily passive or based on the temperature of the source water and the ambient environment. If your water feels room temperature or "not cold enough," it is typically because the water has sat in the internal storage tank or the glass carafe, reaching thermal equilibrium with the surrounding air. Because the unit uses a high-pressure pump to push water through a semi-permeable membrane, the process itself does not remove heat from the water. If the unit is placed near a heat source—such as a toaster, coffee maker, or in direct sunlight—the water in the reservoir will actually warm up above the ambient room temperature. To confirm the issue, measure the temperature of the water immediately as it exits the faucet versus the water that has been sitting in the carafe for an hour; if the exit water is cool but the carafe water is warm, the issue is environmental insulation, not a mechanical failure.

How to Fix It

Since the AquaTru does not have a user-adjustable thermostat or a dedicated cooling dial, you must optimize the thermal environment and the delivery method to achieve colder water. Follow these steps:

1. Relocate the Unit: Move the AquaTru at least 6 inches away from any heat-generating appliances. Ensure there is a minimum of 4 inches of open air space behind the unit to allow the internal electronics and pump to dissipate heat.
2. Pre-Chill the Carafe: The glass carafe is a heat sink. Before filling it, rinse it with cold water or store the empty carafe in the refrigerator for 10 minutes. This prevents the glass from warming the water immediately upon dispensing.
3. Optimize Source Water: If your home's incoming water line is warm (common in summer months), the RO process will maintain that warmth. Ensure your cold water intake line is not running adjacent to a hot water pipe or heater.
4. Cycle the Water: If the unit has been idle for several hours, the first 8-12 ounces of water may be warm due to stagnation in the internal lines. Dispense a small amount of water and discard it before filling your carafe to ensure you are getting fresh, cooler water from the membrane.

If That Didn't Work

• External Refrigeration: The most effective solution for the Glass Carafe model is to utilize the carafe's intended design: fill it and immediately place it in the refrigerator. The glass is designed for temperature retention; by chilling the vessel itself, you maintain the water at 35-40°F, which the countertop unit cannot achieve on its own.
• Check for Pump Overheating: If the unit feels excessively hot to the touch on the side panels, the pump may be working too hard due to a clogged pre-filter. Replace the sediment and carbon pre-filters (Part #AT-PF) to ensure the pump isn't overheating and transferring that heat to the water stream.
• Inspect for Air Locks: If the water flow is slow, it can cause friction and slight warming. Perform a system prime by running the unit for 5 minutes continuously to clear any air bubbles from the RO membrane that might be causing inefficient flow.
• Ambient Temperature Control: If the unit is in a room exceeding 85°F, the internal components will radiate heat into the water. Use a small desk fan to blow air across the rear vents of the AquaTru to lower the internal operating temperature.

Heads Up

• Avoid Direct Sunlight: Never place the AquaTru in a spot where sunlight hits the glass carafe or the plastic housing, as this creates a greenhouse effect that rapidly warms the water.
• Filter Maintenance: Always replace filters on the recommended schedule. Restricted flow increases the load on the pump, which increases the heat generated inside the chassis.
• Carafe Care: Wash the glass carafe with lukewarm water and a soft sponge. Using boiling water to sanitize the carafe can cause it to retain heat longer, warming your next batch of RO water.
• Power Stability: Use a high-quality surge protector. Power fluctuations can cause the pump to cycle irregularly, leading to inconsistent water temperatures.