We recommend Crystal Quest CQE-RC-04019 Fluoride Water Filter Cartridge 20 inches. 20 by 2.5 inches water filter cartridge with aluminum oxide. Reduces fluoride below 0.5 ppm. Water Filter cartridge requires a standard 2.5x20 inches water filter housing for operaion. Fluoride reduction Capacity (<100 ppm hardness): 9,000 ppm Maximum temperature: 100 F (38 C) Minimum temperature: 40 F (5 C) Maximum pressure: 125 PSI (8.6 bar) Minimum pressure: 20 PSI (1.4 bar) AAL fluoride reduction filter cartridge Filter Life: 1 year..

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