Replacement Water FilterIon-resinContact Us to PurchaseFeatures Absorbs hardness minerals and prevents scale from forming. Shrink wrap, clean and reliable. Specification Model Type Spec. Remark FT-0023 T33 Filter 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.