1. Turn off water supply. If your filter housing has a valve on top of it, rotate the handle on top of the housing to the OFF position. Also rotate the handle on top of the tank to the OFF position.

2. If your filter housing has a pressure release button, press it to relieve the pressure in the filter housing.

3. On most membrane housings, you can unscrew the cap. (On some housings, the cap is glued on in which case you have to buy a new membrane housing.)

4. There is a rubber brine seal around the circumference of the membrane. As you are removing the old membrane, note which end the rubber brine seal is on so you can insert the new membrane in the same way. When you have removed the used membrane, discard it. Rinse out the housing and fill it about 1/3 full with water. Add about 2 tablespoons of bleach and scrub thoroughly with brush or sponge. Rinse thoroughly.

5. Remove the O-ring/Gasket from the housing and wipe the groove and O-ring/Gasket clean. Lubricate the O-ring/ Gasket with a coating of clean petroleum jelly (Vaseline). Place the O-ring/Gasket back in place and press the O-ring down into the groove with two fingers.

NOTE: This step is important to ensure proper filter seal. Make sure the O-ring is seated level in the groove.

CAUTION: If O-ring/Gasket appears damaged or crimped it should be replaced at this time. See your dealer for replacement parts.

6. Insert a new membrane into the housing. Turn the housing over and press the membrane tube down against a table so as to push the membrane into the tube until in "clicks" into place.

7. Screw the cap onto the housing and hand tighten.

8. Turn on the handle on the tank. Turn on the water supply slowly to allow the housings to fill with water.

9. Check for leaks before leaving installation.

WARNING: Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the unit.