... % solution: 4.2-4.8 10, Chloride, as CI: 0.003 pct max11, Water insoluble: 0 ... 1 pct max12, Heavy metal, As Pb: 0.001 pct max13, Arsenic, as AS 0.0003 pct max 14, ... treatment,electroplating, to produce sodium hexametaphosphate, detergent, metal cleaning agent,precipitant of dyes and pigment 17, Capacity ... phosphate fertilizer are well used in such fertilizer industries as DAP, MAP,UP, FMP, SSP, TSP, MKP ...