Why is my Pentair Water Filtration System delivering hard water?
- JJohn GarciaNov 21, 2025
If your Pentair Water Filtration System is delivering hard water, it could be due to several reasons. First, ensure the by-pass valve is closed. Check that there is enough salt in the brine tank, maintaining the salt level above the water level. Inspect and clean or replace the injector and/or filter if they are plugged. Also, check the brine tank filling time and clean the flow regulator if there's insufficient water flowing into the brine tank. Consider flushing the hot water tank repeatedly if the hardness is from there. Examine the distributor hose for cracks and check the o-ring. Other potential issues include an internal valve leak (change seals & spacers and/or piston assembly), a blocked meter (clean or change it), a disconnected/faulty meter cable (check connections and change the...














