Zep Liquid Heat Max Clog Remover Gel is our most powerful formula, designed to tackle the toughest clogs—especially hair, the #1 cause of drain blockages. Its thick gel cuts through standing water and clings to build up for deep, professional-strength performance—no plumber needed" Ultimate Drain Power: Zep s strongest formula blasts through the most stubborn clogs trusted performance you can count on. Unmatched Performance on Hair: Specially designed to dissolve hair clogs with ease, while also breaking down grease and buildup. Maximum Contact Formula: Thick gel clings to clogs and penetrates deeply even through standing water for enhanced effectiveness. Use Anywhere: Versatile enough for bathroom sinks, tubs, showers, and kitchen drains. Pipe & Septic Safe: Will not harm plumbing or septic systems when used as directed. Pro tip: run hot water in pipes before and after using liquid heat to help loosen build up and flush out the pipes. Do not use drain cleaner in toilets or garbage disposals. Instructions: Pour in 16 ounces, wait 5-10 minutes for clog to clear, and rinse with hot water. For extremely tough clogs, wait for up to 20 minutes before rinsing.