We recommend Crystal Quest CQE-RC-04044 Inline GAC+KDF Water Filter Cartridge. Inline GAC + KDF water filter that is commonly used on Reverse Osmosis water filtration systems. Reverse Omsosis Granulated Activated Carbon (GAC)/KDF inline combination cartridge for Reverse Osmosis water filters. Removes hundreds of contaminants from drinking water (if present). Working media: * Granular Activated Carbon * KDF or Eagle Redox Alloy Filter life: 1 year Connection: 1/4" quick connect.

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