We recommend Crystal Quest CQ-W13F-ULTRA Undersink Water Filter With Fluoride Removal, Double Cartridge - ULTRA. Undersink Water Filter with dual cartridges, that includes a Fluoride removal filter, and a 6-stage filter that removes hundreds of contaminants from water. Water travels through 7 stages of filtration. Undersink Dual Cartridge Filter features: First, water travels through 6-stage water filter, that incorporates 1-micron filter pad, a KDF-55D and KDF-85D media, ion exchange resin, GAC (granulated activated carbon) media, and another 1-micron filter pad. Second, water travels through a Fluoride Removal Cartridge, containing fine-mesh pre-resin media (SIR-900) that reduces fluorides below 0.5 ppm, and also removes arsenic. Easy to use and install on all standard sinks. Fluoride Filter Capacity: is up to 15,000 ppm with effluent levels below 0.2 ppm from 10 ppm feed. Note: high pH and high bicarbonate levels reduce the capacity - above 100 ppm bicarbonate, reduction by 50%; above 200 ppm, reduction by 75%. Total Capacity: 10,000 gallons (1-3 years)* of quality safe and pure water for -PLUS system, 20,000 gallons for -ULTRA (2-4 years)* and 30,000 for ULTIMATE (3-5 years)*. Filter Replacement Interval: Carbon Filter 6-12 months, Fluoride filter 12 months, 6-stage PLUS 2-3 years. Filters 20,000 gallons.

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