Question: How Do I Replace The Membrane On My RO System?

Answer:

R.O. Membrane – Turn the water off at the inlet saddle valve (or supply valve) and open the RO faucet to drain the storage tank. When the storage tank has been emptied, close the RO faucet. Next, close the valve on the storage tank. Disconnect the tubing going into the end of the membrane housing on the end that has only one tube going into it. Once you have removed the tubing, unscrew the end cap of the membrane housing. Have a container in place as water will pour out. Remove the old membrane from the housing (this may take an extra pull as they sometimes fit very tight) and clean the inside of the membrane housing with warm soapy water. Grease the “o” ring with food grade oil. Insert the new membrane in the direction of the arrow on the membrane. The end with the two small “O” rings goes in first on the regular, industry standard membranes. The end with the large rubber ring (brine seal) goes in last, next to the removable end cap. Be certain that the center tube of the membrane is seated properly into the receiver in the bottom of the housing. Push firmly! Screw the end cap back on and reconnect the tubing into the fitting on the end of the membrane housing.
Open the RO faucet. Open the inlet saddle valve (or supply valve) to feed water to the RO system. Do not open the storage tank valve at this time. Allow the water to drip from the faucet for at least 1 hour. This procedure will fulfill the requirement of flushing the RO membrane as may be described on the membrane packaging. After one hour, close the RO faucet and open the storage tank valve. Allow the system to fill the tank and shut off. Then open the faucet and drain the tank. Repeat this 2 more times, for a total of 3 full tanks to fill and then drain. This will flush the preservative from the membrane and remove any black, dirt looking, carbon fines from the water before using the water for drinking or aquarium usage.