Drummond™ - So-Drox Liquid Drain Opener and Sewer Line Restorer - Bottle, 32 fl. Oz. 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.