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Give the water storage tank a shake to make sure that it is empty. If the tank still has water in it, locate the air valve on the tank that is just like one on a bicycle tire and give it 6 pumps of air with a bicycle pump and let it empty. Check the pressure of the emptied tank with a .

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Here are the possible reasons your reverse osmosis tank is not filling up. Low Water Pressure and Supply; For a reverse osmosis system to work efficiently, it requires a pressure of at least 40 pounds per square inch. If the water pressure inside the RO system is too low, the semipermeable membrane will not filter much water.