Top 10 Washing Powder (Detergent) Brands in India
May 22, 2020·6. STPP. Sodium tripolyphosphate (STPP) is also known as Penta-sodium triphosphate. It is used in washing powder to make the hard water soft. Sodium tripolyphosphate is helpful in cleaning products, water treatment facilities, and food preservatives and used by the manufacturer.. STPP is harmful to the environment, and its less quantity in a washing powder is considered better.