HomeReplacement Water Filter5” CTOContact Us to PurchaseFeatures Remove chemicals and odors, such as chlorine and chemical fertilizer. Shrink wrap, clean and reliable. Specification Model Type Spec. Remark FT-0039 CTO 5" 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.