Shut off the water supply to the filter system. If the filters feed an RO system, close the RO tank valve too.
Relieve the pressure. Open the downstream faucet or RO faucet and let the water stop flowing.
Place a towel and a small container under the system to catch water.
Remove each housing with the filter wrench. Turn counterclockwise and support the housing as it comes free.
Remove the old filters and rinse the housings with clean water. Check that each O-ring is clean, seated correctly, and undamaged.
Place the new filters in the correct housings. Match each filter to its labeled stage and make sure it sits securely in place.
Reinstall the housings. Start each one by hand to avoid cross-threading, then hand-tighten until snug. Don’t over-tighten with the wrench.
Close the faucet, then slowly reopen the water supply. Check around each housing for leaks.
Flush the filters. Run water through the downstream faucet for about 5 minutes, or until it runs clear, to flush out carbon fines. If the filters feed an RO system, keep the tank valve closed during this step.
Check for leaks again after flushing. If you closed the RO tank valve, reopen it and allow the tank to refill. Discard the first few minutes of water from the RO faucet.
