... Specifications1,Manufacturer of Sodium Tripolyphosphate (STPP) 2,Free sample 3,High quality and competitive price 4,Quickly deliveryProduct DescriptionProduct: Sodium Tripolyphosphate ( ... such as Ca 2+, Mg 2+, can soften hard water, change suspension into solution, slightly alkaline, without causticity. 2, Usage: ... your special requirements for packing. Sodium Tripolyphosphate STPP 94% High quality