Clogged drains are no match for Flow-Easy sulfuric acid drain opener. Its proprietary virgin sulfuric acid formula dissolves grease and other organic material fast, so your drains open almost instantly. Flow-Easy is the fast-acting, professional-strength drain opener that plumbers reach for first. But it's still safe enough for home use in all types of drains and toilets, even with septic systems. Flow-Easy powers through clogs other drain openers can't. And it can be poured into standing water, eliminating the need to bail the sink before using.