Nitrate and nitrite are the most common nitrogen contaminants of drinking water. Since anion exchange resins are generally more selective for sulfate over nitrate, the capacity of a resin for nitrate removal will be limited by the concentration of sulfate. If the ratio of sulfate to nitrate is low, a high capacity resin like DOWEX™ 1 is recommended. If the ratio of sulfate to nitrate is high, a nitrate selective resin should be considered like DOWEX™ NSR-1/AMBERLITE™ PWA-5 resin. These resins can be regenerated using NaCl. In regions where brine waste handling is of issue the Advanced AMBERPACK™ Municipal can help reduce NaCl waste levels.