Step 6 · Turn on Water and Check for Leaks
This is the most critical step. First, ensure the filter cartridge is NOT yet in the housing. Close the two ball valves leading to the filter and open the ball valve on the bypass loop. Make sure all faucets in the house are still closed. Go to the main shutoff valve and turn it on very slowly, allowing the pipes to fill with water gradually. Listen for the sound of rushing water to stop. Go back to the filter assembly and meticulously inspect every single joint and fitting for drips. Use a flashlight and a dry paper towel to wipe each connection and check for moisture. If you find a leak, shut off the water and tighten the leaking fitting slightly. Once the bypass is confirmed leak-free, close the bypass valve and slowly open the inlet and outlet valves to the filter housing. Again, check all connections around the filter housing for leaks.