A unique formula of concentrated virgin sulfuric acid that is more powerful and safer than other drain openers. S-T operates at a lower heat, yet quickly dissolves grease, diapers, cigarette butts, hair, bone scraps, coffee grounds, rinds and soap. S-T is friendly to PVC pipes and septic systems and it will thaw frozen pipes. Properly used, this product will not adversely affect septic tanks, drain fields. Regular use in drains as preventative maintenance procedure will keep drains clean and free flowing.