Do plumbers offer a written warranty? Very natural non-toxic formula with no harsh chemicals to harm the environment or pipes keeps septic system balanced digesting waste and removal of sludge deposits in leach lines and field one treatment lasts months -- just simply flush down the toilet this is the second home where i have a septic system and have. Kurt at koegel plumbing is amazing!! should have called him sooner thank you!!! Detection of vermin / rat infestation within the drainage system. If.