So-Drox is an alkaline liquid drain opener and sewer line restorer. It is concentrated to attack, penetrate, and liquefy the toughest clogs. Unlike household drain openers, So-Drox does not contain bleach and has a fresh lemon scent. Maximum strength – stronger than any alkaline drain opener on the market today. Fast acting – breaks down clogs and restrictions formed from grease, fat, paper and organic matter. Safe on all plumbing materials including cast iron, PVC, ABS, copper, steel, rubber fittings, porcelain – will not harm septic systems. Deodorizes as it cleans.