Zep 1 Gallon 10 Minute Drain Opener Gel works fast to unclog your pipes of build up, restoring flow in minutes. The commercial-strength formula in this drain cleaner is designed to dissolve hair and grease on contact. Able to pour through standing water, removing the root of the clog. It is safe for all pipes and septic systems, making this home drain cleaner perfect for bathroom sinks, tubs, and shower drains.