Formulated for use in: sewage treatment plants and lagoons and for the treatment of septic tanks, cesspools, drains and grease trap. Non-caustic and non-corrosive. Will not attack metals or porcelain finishes as in sinks and wash basins. Ingredients are non-toxic. Contains the necessary specific enzyme systems for accomplishing the digestion of protein, fats, starches, carbohydrates, and cellulose. In addition, STD 1000 contains both aerobic and anaerobic bacteria as well as microbial nutrients.