Water Filters to Remove Nitrates and Sulfates

Various regulatory agencies deem nitrates in excess of 45 mg/l as NO3 (10 mg/l as N) to be harmful especially to infants, the elderly, and immune system compromised people. It is also harmful to some fowl and livestock. Sulfates in excess of 250 mg/l may have detrimental health effects.

Since the late 70’s, special ion exchange resins have been available to remove nitrates and sulfates from water. These are anion resins typically provided in the chloride form. Their important feature is that they do not release accumulated nitrates or sulfates which is referred to as “dumping”. As a result, even if there is a failure the water out of the systems never has a content of either nitrates or sulfates higher than the incoming water.

Such systems are exactly like a residential or commercial water softener in function and appearance except SOME of the softening resin is replaced with the special anion resin. By having both types of resin in the same tank (they do not mix but rather stay in separate layers) full use of the salt is obtained — sodium or potassium (Na or K) for the softening resin and chloride (Cl) for the nitrate/sulfate resin—and maximum efficiency is obtained.

By knowing the capacity of the anion resin (about 15,000 grains/cu. ft.) and the softening resin (about 30,000 grains per cu. ft.) and the nitrate plus sulfate content of the water converted to grains per gallon as calcium bicarbonate we can put the exact ration of each resin into a tank. All systems include meters to establish the proper point of regeneration and where critical alternating twin systems are employed to guarantee treated water 24/7. Properly designed and maintained, nitrate and sulfate reduction will exceed 95%. The content of sodium/potassium and chloride in the treated water will rise proportional to the level of the hardness + nitrate + sulfate.

For more information on water treatment for your home or business, click on one of the following topics:

Reverse Osmosis Overview, Residential Reverse Osmosis, Commercial Reverse Osmosis, Water Softener Overview, Commercial Water Softeners, Residential Water Softeners, Water Filter Overview, Backwashing Water Filters, Non-Chemical Water Conditioners, Aquafer Water Conditioner, Maxi-Cure Water Filter, Scale Prevention Devices, Ultra Violet Disinfection, High Purity Water, De-ionization, Specialty Water Filtration, Reverse Osmosis Repair, Commercial Water Softener Repair, Residential Water Troubleshooting, Commercial Water Troubleshooting.

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