Ro Water Filter Tank Pressure

Point y on figure 1.

Ro water filter tank pressure.

If the water pressure feeding an ro system is less than that the system will produce less water and at a lower quality. Allow four hours for the tank to fill and try again. Open the cap at the bottom of the tank to access the pressure valve. Use air compressor or bicycle pump to re pressurize the 4 gallon tank to 5 psi and 7psi for the 14 gallon tank.

Reconnect the yellow line at point y. Turn off the feed water supply to the ro. You might have low air pressure inside the ro tank itself. If it s lower than that add more pressure using a bicycle pump up to 5 psi.

To check your pressure locate the schrader valve typically covered by a blue plastic cap on the side of the tank near the bottom. Using a pressure gauge check the air pressure in the tank. You can find these at auto parts stores or hardware stores. To check the pressure accurately you need a low pressure air gauge.

The water pressure decreases as the tank gets near empty since the reverse osmosis filter produces water at a slow rate. The standard air charge for undersink ro tanks is about seven psi when there is no water in the tank. You have to empty the tank of water in order to check the air pressure. Use an air pressure gauge to check the current air pressure.

Most ro units have an automatic water shutoff that kicks in when the pressure inside the tank reaches 2 3 of the pressure of the water flowing from your main line into the ro system. Drain the old tank completely thru the spigot. It should be around 5 psi for a standard 4 gallon tank 3 2 gallon capacity. Most standard reverse osmosis tanks are three to four gallon tanks that work best when the pressure in them is between six and ten pounds per square inch psi so the magic number that we are shooting for is eight pounds of pressure.

Disconnect the yellow line from the tank valve. Your tank should have pressure of 7 to 8 psi without any water in the tank. If your feed pressure is 60 psi the membrane will continue to filter water and fill the storage tank until the compressing air within that tank reaches 40 psi. It takes 4 hours to produce 2 gallons of water.

Locate the pressure valve under the blue cap on the tank. In the pnrv18 model the tank holds approximately 1 5 gallons and in the pnrv model it holds 2 1 gallons. If your city water pressure is around 50 psi the system will shut off water production when the tank reaches a pressure of 30 or so psi. Private well systems most commonly have pressurized storage tank and pump systems with 20 40 psi or 30 50 psi on off pressure settings.