The bacteria used in Bio-Clean is grown in incubators and then dried and mixed with enzymes and other helpers. They lie dormant until they are mixed with water. and then it is hungry and active in about 30 minutes. Each piece of bacteria eats its own weight in waste in about one minute. but they also multiply. Bio-Clean is completely safe for use in your sewer system. It is approved by the EPA in all 50 states. For Instructions and information on the uses of this product click the link to the right under the Bio-Clean picture.