How often do I need to replace the filter cartridge in my FloWater Faucet FIlter? Steve Giles March 08, 2021 19:17 Updated The filter cartridge in your FloWater Faucet Filter needs to be replaced every 3 months. Click here for directions explaining how to use the calendar wheel on your FloWater Faucet Filter to remind you when it's time to change the filter cartridge. Related articles How does the FloWater Faucet Filter calendar wheel work? How often do I need the filters changed on my Refill Station? Can I change the filters in my Refill Station myself? Is FloWater Faucet Filter compatible with my faucet? The FloWater Faucet Filter broke or is leaking after the installation. Is that normal?