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. Clog remover pours through standing water and works fast to clear clogged drains and restore them to a free-flowing state. Comes in gal. capacity. Safe for all pipes, it works great to remove hair, soap scum, and other gunky clogs. Meets or exceeds NSF standard. Formulated thick, pours fast through water straight to the clog. Features 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. Safety Data Sheet.