We recommend Crystal Quest Refrigerator-Nitrate InLine Nitrate Water filter
. 6 stages Nitrate in-line filter is designed for use on refrigerators with ice-makers and/or water through the door. It may be used with water fountains, water coolers, commercial coffee makers and ice machines as well. High-pressure quick-connect fittings can be used on either 1/4" o.d. copper or plastic tubing. Water travels through 6 stages of filtration Contains a special nitrate-selective resin. Nitrate reduction is 90% to 95% and breakthrough is not affected by sulfate levels. The capacity is 3000 ppm of nitrates as CaCO3. To determine capacity, first calculate the ppm of nitrates as CaCO3, then divide that number into 3000 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. Dimensions: 5" x 16" Weight: 6 lbs Flow rate - .75 to 1 gallon per minute.
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