We recommend Crystal Quest CQ-W14F-PLUS Triple Undersink Water Filter With Fluoride Removal - PLUS. Crystal Quest Undersink Water Filter with Fluoride Removal cartridge uses three cartridges: a Carbon Block cartridge, a Fluoride removal filter and, a 6-stage filter that removes hundreds of contaminants from water. Water travels through 8 stages of filtration. Under Sink Filter With Fluoride features: * First, water travels through a Carbon Block cartridge for removing volatile organic compounds (VOCs, insecticides, pesticides and industrial solvents). * Second, water travels through Fluoride removal cartridge, containing fine-mesh pre-resin media (SIR-900) to reduce fluoride below 0.5 ppm. This filter also effectively removes arsenic. 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%. * Third, water travels through a 6-stage cartridge that removes hundreds of contaminants. W14F Filter installs easily under any standard sink. Best fluoride removal is at 0.3-0.5 gallons per minute flow. Total Capacity: -PLUS: 10,000 gallons (1-3 years)*, -ULTRA: 20,000gallons (2-4 years)* (* - estimate, your situation may vary). Filter Replacement Intervals: Carbon 6-12 months, Fluorde 12 months, PLUS 6-stage filter 2-3 years. Filters 10,000 gallons.

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