High levels of nitrates in water are dangerous (legal limit in potable water is 50mg/l). A nitrate reduction system is made up of a high quality vessel filled with nitrate selective resin with a multi-port valve on the top. The nitrate rich water passes over a resin where the nitrate is exchanged for chloride ions. Periodically this nitrate needs to be removed by regenerating with salt. As the nitrate levels vary from month to month a time based regeneration system is recommended.

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