We recommend Crystal Quest CQE-RC-04061 Inline Nitrate Removal Filter for RO and Bottleless Coolers. Inline Nitrate Removal Cartridge. Available as addition to Reverse Osmosis and Bottleless Water Cooler systems. Nitrate Removal Filter contains a special nitrate-selective resin. Nitrate reduction is 90-95% and is not affected by sulfate levels. This nitrate removal cartridge can be regenerated using sodium chlorine brine. Filter Capacity: 510 grains or 8720 ppm (parts per million) of nitrates as CaCO3 Flow Rate: 0.5 GPM (gallons per minute) Micron rating: 5 nominal Filter dimensions: 13x3, total dimensions with connectors: 15x3 inches Filter life: approximately 1 year if using municipally treated water..

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