I hear water going into the drain even if no one used the filtered water in a while

It's possible that the water pressure variation from the well pump or municipality caused the system to go into production mode. Or if you have an ice maker in the fridge, it might have been making some ice and using the water.

Otherwise, it might indicate a possible leak of filtered water. Please double-check the tank, filtered water faucet, and all fridge connections for leaks.

To make 100% sure that the system shuts off when the tank is full, verify it with the following steps:

  1. Turn off the holding tank valve and let the system pressurize entirely - taking about 1-2 minutes. Make sure the fridge/ice maker is not using filtered water (if connected) and that there are no leaks.
  2. Once the system is pressurized, it will automatically shut off, and you should no longer hear water going down the drain.
  3. If the system doesn't shut off within a few minutes, it might indicate that the home water pressure is too low or that the shut-off valve is faulty and needs replacement.
  4. To return to normal operation, turn the shut-off valve on the holding tank back to the "on" position.

How full the tank gets varies with incoming line pressure to the undersink reverse osmosis system. If there are no leaks, it might seem like the system is randomly turning on. But, in reality, the well pump might have turned on, or the water line pressure has changed from the municipality.

Another possible reason is that the flow restrictor from the membrane drain line connection was misplaced or accidentally removed during installation or the filter change. Please see the below picture for its location. If the flow restrictor is missing, it will cause the system to drain nonstop and produce low or no filtered water. We do have replacements available. Please get in touch with our customer service.

Flash flow restrictor location

Nov 7, 2023

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