Best on toughest clogs, guaranteed! Safe for all pipes. Don"t get caught without it! Better than Drano Max on the toughest clogs (based on full hair clogs in lab tests). Patented Gel penetrates and dissolves clogs. Works fast to clear fully clogged drains with standing water and slow drains. Removes hair, gunk, grease and soap scum. Safe for all pipes (PVC, plastic, copper, old pipes), septic systems and garbage disposals (for garbage disposals, follow same usage direction and flush with disposal running. Avoid all splashing. Do not use with plunger or in toilets). Contains no phosphorus.