ZEP Liquid Heat Gel Drain Opener uses an advanced chemistry designed to eliminate even the toughest clogs. This home drain cleaner is specially formulated to cling to obstructions that are impending drain flow within your pipes, even in standing water. Able to quickly open tough clogs in kitchen, bathroom, tub and shower drains, this industrial drain cleaner is guaranteed to eliminate any tough clogs in less than 10-minutes. Penetrating gel formula is perfect for use in kitchen sinks where food build up is slowing water and in tubs or showers where hair is impeding drain flow. Drain care directions: Step 1: Pour 16 oz. directly into drain. Step 2: Allow to work for 0-minutes to 7-minutes. Step 3: Flush with warm water. Repeat if necessary.