Hard water has met its match Deep clean your clothes and protect the environment. Biodegradable phosphate that helps bring out the gbest of Charlie's Soap without leaving any reidues on your clothes. Controls minerals in your wash water with just 1/2 tablespoon per load. Non-toxic. Septic Safe. Completely soluble; will not clog your machine. Certain phosphates can safely eliminate problems associated with hard water and be environmentally friendly. They are only a problem with overuse. While septic safe in general, if you use it daily, you may need to periodically replenish your septic system with an enzyme and germ replenishment product. Powerful water softening without all the chemicals.