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Hydrolyzed polymaleic anhydride is a phosphorus-free water treatment chemical. Hydrolyzed polymaleic anhydride (HPMA) is the product of partial hydrolysis of polymaleic anhydride. It forms a chelate with calcium and magnesium ions in water. The aqueous solution is brownish yellow or brownish red, viscous, acidic liquid. Hydrolyzed polymaleic anhydride (HPMA) is chemically stable. It can be used at temperatures below 350 °C. HPMA chemical is phosphorus-free, non-toxic and environmentally friendly. It can be degraded by microorganisms in the natural environment. The degradation products have no effect on the ecological environment.