Drano Max Gel is thicker than Liquid Plumber Gel so it clings to clogs longer to clear clogs better. Drano Max Gel pours through standing water and works fast to restore your drains to their free-flowing state. Safe for all pipes, it's also the best at removing hair, soap scum, and other gunky clogs. Will not harm pipes when used overnight. Contains no phosphorus. Features Formulated thick to dissolve the toughest clogs fast. Pours through water straight to the clog. Contains a special ingredient to protect pipes from corrosion. Safe for plastic, PVC, metal pipes, garbage disposals.