How to Check Reverse Osmosis Water Filter Tank Pressure

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A reverse osmosis (RO) system sends water through a semi-permeable membrane at a high rate of pressure. The pure water crosses the membrane while the minerals and debris remain on the other side of the membrane. If the water level in the tank seems low or there's little water coming from the faucet, check the reverse osmosis tank pressure.

Things You'll Need

  • Air pressure gauge
  • Turn off all water faucets.

  • Open the reverse osmosis tank valve, and attach a calibrated air pressure gauge.

  • Check the calibrated air pressure gauge for the tank pressure, which should be at least 7 pounds per square inch (psi).

  • Increase air pressure as necessary to 7 psi.

  • Close the tank valve cap, and slowly turn on the water faucet.

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