What do I do with the used Filter cartridge from my FloWater Faucet Filter? Steve Giles March 08, 2021 19:04 Updated The used cartridge should be disposed of. Do not throw away the white cartridge housing. Related articles How does the FloWater Faucet Filter calendar wheel work? Can I recycle the FloWater Faucet Filter cartridges? How do I dispose of the Filter Replacements from my FloWater Faucet Filter?