Replacement Water FilterBio-ceramicContact Us to PurchaseFeatures Prevents scale and corrosion by chelating hardness ions. Specification Model Type Spec. Remark FT-0033-1 Polyphosphate Crystal, Transparent Cassette Cartridge 10" Note Do not use where the water is microbiologically unsafe or of unknown quality without adequate disinfection before or after the unit. The system is to be supplied only with cold water. The system and installation shall comply with applicable state and local regulations.