Crystallization seed-containing composition

摘要

A composition of matter capable of rapidly reducing free metal ion concentration in an aqueous solution when added thereto containing a material capable of forming a water-insoluble reaction product with said free metal ions and a crystallization seed which provides growth sites for said reaction product so as to cause rapid precipitation of said reaction product. The rapid precipitation of the reaction product has the effect of rapidly reducing the free metal ion concentration of the aqueous solution.