Aries (AF-20-3318-BB) 20"x4.5" Big Blue Scale Inhibitor Phosphate Filter KDF-85 (WST-M-KDF85057-1) Process Media Specialized for Iron & Hydrogen Sulfide Removal - 1 lb Bag This dual-media cartridge fits standard

This dual-media cartridge fits standard big blue housings and handles the toughest well water challenges including metallic taste

Replace the entire filter body in seconds by detaching from the permanent head

Direct replacement for Q54xx series cartridges

Membrane Replacement

Aries (AF-20-3318-BB) 20"x4.5" Big Blue Scale Inhibitor Phosphate Filter KDF-85 (WST-M-KDF85057-1) Process Media Specialized for Iron & Hydrogen Sulfide Removal - 1 lb Bag This dual-media cartridge fits standardAries Filter Works AF 20 3318 BB 20"x4. 5" Big Blue Scale Inhibitor Phosphate Filter Food grade phosphate crystals that prevent scale buildup and corrosion in whole house and commercial water systems NSF 61 Listed FDA Grade Materials 20" x 4. 5" Big Blue Whole House The Aries AF 20 3318 BB uses pharmaceutical grade polyphosphate crystals to sequester hardness minerals and prevent lime scale from forming on pipes, heating elements, and glass surfaces.