Sodium tripolyphosphate (STPP) - is widely used as a component for the production of synthetic detergents, water treatment, as well as in the ceramic, paint, varnish and other industries. When producing synthetic detergents, STPP is usually added to the pulp. STPP with a high rate of hydration is preferable to use on modern equipment due to a shorter period of reaction with water, which is required for powerful high-speed mixers. On other equipment, it is recommended to use STPP with medium and/or low rate of hydration, which avoids the formation of lumps in the detergent slurry.