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Amazon.com: Premier KDF 55 + Coconut Shell Carbon Filter Cartridge | Reduces Heavy Metals, Chlorine | 2.5" x 10" Standard Size Cartridge : Tools & Home Improvement
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Amazon.com: Replacement Water Filter Cartridge KDF 55/85 + GAC | 4.5" x 10" (KDF 55) Compatible with Big Blue Housing by Oceanic Water Systems : Tools & Home Improvement
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KDF 55 : Filter Media for Chlorine, Heavy Metal, Bacteria, Iron Removal (1 lb): Amazon.com: Tools & Home Improvement
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