KDF Water Filter With KDF 55 Redox Media #AF-10-2025. Standard Size Replacement Filter Cartridge 10" X 2 3/4". For slimline and standard size housings. Excellent for chlorine and heavy metals reduction. Effective to treat for sulfur & iron. KDF media also controls scale, algae, and bacteria. 12 per case, sold individually. Order a case and save even more.