STPP 1.High quality & reasonable price 2.Appearance: White powder or granular 3.Sttp over15years manufacturer 4.Prompt ship STPP1. Properties: White microdot powder with luster, melting point at 622 o C, easily soluble in water, with remarkable chelating ability to some metal ions such as Ca 2+, Mg 2+, can soften hard water, change suspension into solution, slightly alkaline, without causticity. ...