Drano Max Gel Clog Remover - Unclog Your Drain with a Maximum Strength Gel Formula. Drano Max Gel pours through standing water and works fast to clear clogged drains and restore them to a free-flowing state. Safe for all pipes, it works great to remove hair, soap scum, and other gunky clogs. Formulated thick to dissolve the toughest clogs fast. Pours through water straight to the clog. Has an ingredient to protect pipes from corrosion. Safe for plastic, PVC, metal pipes, garbage disposals and septic systems. Won't harm pipes when used overnight. Contains no phosphorus.