JS fine chemicasl co.,ltd is the major manufactuer of the following products in China. SODIUM HYPOPHOSPHITE CALCIUM HYPOPHOSPHITE HYPOPHOSPHOROUS ACID Tetrakis(hydroxymethyl)phosphonium chloride(THPC) Tetrakis(hydroxymthyl)phosphonium chloride-urea(THPC-UREA) Tetrakis(hydroxymethyl)phosphonium sulphate(THPS) Tetrakis(hydroxymethyl)phosphonium sulphate-UREA(THPS-UREA) If you are interested in our products, please kindly contact us . We will provide you competitive price Thanks and best regards. Joe Sun /Candy zhang JS FINE CHEMICAL hengshui office Tel:0086-13503183001 FAX:0086-318-2203888 msn messenger: yahoo messenger: .cn