Check for loose or aging sealing rings
Filter connections usually feature sealing rings to prevent leaks. First, shut off the water supply (if using a faucet-mounted filter), then use a wrench or your hands to gently unscrew the leaking section. If the sealing ring appears deformed, cracked, or covered in grime, simply replace it with a new one. Ensure proper alignment during installation and tighten gently; do not use excessive force.
Check for loose connections
Leaks are sometimes caused by connections that haven't been tightened sufficiently. Shut off the power or water supply, disassemble the filter, and inspect every connection point. For threaded connections, wrap the threads a few times with PTFE tape (clockwise) before screwing the fitting back on to improve the seal. For snap-fit connections, check the clips for breakage or deformation and replace them if necessary.
Repair or replace damaged piping
If the pipe itself is cracked and leaking, shut off the water supply and remove the leaking section. Lightly sand the damaged area, apply epoxy resin, and wrap it with waterproof tape. If the crack is large, it is best to replace the pipe with an identical model. Ensure the replacement pipe material matches the original filter setup-for example, do not mix metal and plastic pipes.
Check for valve malfunctions
Aging or damaged filter valves can also cause air or water leaks. First, verify that the valve is in the closed position; automatic valves may require periodic cleaning or adjustment. For manual valves, try turning the handle a few times to ensure it opens and closes correctly. If the valve is rusted or jammed internally, disassembling and cleaning it, followed by applying a few drops of lubricant to the valve core, will usually resolve the issue.