We recommend Crystal Quest CQE-RC-04050 Nitrate Multistage Water Filter Cartridge 10x2.5. Contains a special nitrate-selective resin, and 5 stages of additional water filtration to provide high quality drinking water. Nitrate reduction is 90% to 95% and breakthrough is not affected by sulfate levels. The capacity is 3000 ppm of nitrates as NO3. To determine capacity, first calculate the ppm (mg/L) of nitrates, then divide 3000 by that number to get the gallons. This cartridge can be regenerated using sodium chloride brine. It also contains 2-one micron filter pads, KDF 55, KDF 85 and coconut shell GAC. Capacity: 3000 ppm Flow rate: 0.5 GPM 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) Micron rating: 5 nominal.

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