Roebic K-37 Septic Tank Treatment prevents clogging of inlets and outlets, build up in the tank, overflowing receptacles and unpleasant odors. Use regularly to keep your septic tank in excellent condition. It easy to use, simply shake well and pour the entire contents of the bottle into your toilet and flush twice. Use this twice a year, or as needed, to keep your tank running optimally. Roebic has been a trusted brand providing products to maintain septic tanks since 1959. Septic Tank Treatment is formulated with RoeTech, Roebic's exclusive bacteria to break down sewage waste. It is a blend of beneficial bacteria that thrive in a "septic" environment (low oxygen, high nitrate), and through their metabolic activities they accelerate the breakdown of sewage waste, which helps to keep your septic tank functioning properly. Using K-37 is a natural way to keep your system clean, there are no harsh chemicals that can destroy the natural balance needed by your septic tank to work properly. It is safe to use in all pipes and for the environment.