| http://www.w3.org/ns/prov#value | - Preferred seeded builders consist of: a water-soluble material capable of forming a reaction product having a solubility in water of less than about 1.4 ??? 10.sup.-2 wt.% (at 25???C) with divalent and polyvalent metal ions such as calcium, magnesium and iron; and a crystallization seed (0.001-20 micron diameter) which comprises a material which will not completely dissolve in water within 120 sec
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