How To Change Reverse Osmosis Filters

Standard Reverse Osmosis Filters 

Reverse Osmosis Drinking Water System

We suggest replacing the filters in our Pro Series reverse osmosis systems every 6-12 months and replacing membranes every 2-4 years. The easy-to-follow steps below will help guide though replacing both.

 Changing Filters

Close the main shutoff valve for your reverse osmosis system and close the blue handled valve on top of the water holding tank. Open the faucet to relieve the pressure in the reverse osmosis system.

Remove each filter housing, one at a time, replace the filter, and reinstall the filter housing using the wrench supplied with your system. You will want to be near a sink or have a bucket to dump the water out of each housing as you remove it. (Changing filters one at a time will help avoid placing filters in the wrong position.)

Once all prefilters are replaced, remove the 10” inline post filter (it will either have a ⅜” push fit connection or ¼” female pipe threaded and included John Guest ¼” and ⅜” push fit connections by male pipe thread.

Replacing the Membrane

Reverse Osmosis Membrane

If replacing the membrane, do so while the post filter is disconnected. Remove the tubing from the membrane housing cap (the thicker end of the housing with only one tubing connection), unscrew the membrane housing cap, and pull out the old membrane with needle nose pliers. Insert a new membrane, trim ¼” off the end of the tubing and reinsert it into the fitting.

Once all filters have been replaced and housings have been tightened, open the valve on top of the holding tank and open the reverse osmosis faucet to drain the holding tank - this will rinse the carbon dust from the post filter. After a few minutes, the tank will be empty

Close the holding tank valve again. After opening the main supply shut off valve, it can be tested by unscrewing the blue cap from the side of the holding tank and checking the pressure using a schrader (same as car and most bicycle tires) tire pressure gauge. The pressure should be 7 - 8lbs.

Pressurizing the System

After 10 minutes, open the holding tank valve and allow the tank to fill for 2 hours before using it. If you changed the membrane, drain the first tank of water and allow it to fill again before using the water.

Have trouble? Give us a call at (888) 309-2837.