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How to Clean a Reverse Osmosis Water System Tank

The tank on your reverse osmosis water purifier is designed to hold two or more gallons of clean water in reserve in order to ensure a continuous flow of purified water at all times. Since the tank holds only water that has been cleaned and is ready for drinking your tank should not need to be cleaned more than approximately once per year unless the manufacturer suggests otherwise.

  1. Turn off the small valve leading from the water supply line to your reverse osmosis water purifier. This should be a small T-shaped valve that you should be able to tighten down (clockwise) by hand. If your system is set up under your sink then the small "T" shut-off valve should be very close to the water turn-off valve under your sink.

  2. Use your pliers or small crescent wrench to loosen the plastic nut holding the in-coming waterline to the plastic tank. A small amount of water may drip out of the hose you have just removed; use paper towels or a rag to clean it up.

  3. Loosen the plastic nut holding the line that exits your tank. Remove the tank from under your sink for easier cleaning.

  4. Remove the top from the tank if a screw-off top is provided. Pour 1 cup of CLR cleaning solution into the tank and then fill the tank with plain tap water. Swish the solution around and then allow it to sit for 30 minutes.

  5. Swish the solution around again and dump the solution down your sink drain. Rinse the tank thoroughly with running tap water, then replace the tank under the sink, reconnect the out-flow line and gently tighten the plastic nut with your pliers or crescent wrench. Reattach the in-coming water line from your reverse osmosis unit and gently tighten the plastic nut with your pliers or crescent wrench.

  6. Open the "T" valve to restore the water flow to your reverse osmosis unit.

  7. Use the funnel to pour water and CLR into your tank through the small water in-let port if your tank does not have a lid that screws off. Allow the CLR to soak in the tank for 30 minutes and then dump the solution and run clean tap water into the inlet port and rinse thoroughly.

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