HEDP is an organophosphonic acid scale and corrosion inhibitor that chelates metal ions and resists scaling under high temperature and chlorine.
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HEDP (1-hydroxyethylidene-1,1-diphosphonic acid) is a phosphonate typically supplied as a colourless, viscous aqueous liquid. It forms stable complexes with calcium, iron, copper and other metal ions and is tolerant of heat and oxidising conditions.
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