Drano® Max Gel Clog Remover. Gel clog remover contains no phosphorus. Thick gel formula clings to clogs longer to clear clogs better. Pours through water straight to the clog.Has a special ingredient that protects pipes from corrosion.Safe for plastic, PVC, metal pipes, garbage disposals and septic systems.Contains no phosphorus.Formulated thick to dissolve the toughest clogs. Heavier-than-water formula pours straight through standing water and works quickly to restore drains. Has a special ingredient that protects pipes from corrosion. Includes twelve 1 quart bottles per case.