Pro-Tec Chemichal (AKA Hi Tec Laboratories #S95-704) FE20 20 OZ Floweasy Organic Professional Drain Cleaner Opener, Organic Digester, Dissolves Grease, Hair, Organic Matter, Sludge, Soap & Paper, Environmentally Responsible, Removes Lime Scale & Rust Deposits, Safe For Septic Tanks & Pipes. Safe for use with metal and PVC pipes, septic tanks, stainless steel sinks, fiberglass tubs, toilets, and standing water. Virgin sulfuric acid with 12 buffers and inhibitors.