1 liter, hair & grease drain opener, a non-acid formulation made for the most common drain stoppages, dissolves hair clogs from bathroom drains & creates heat to melt grease from kitchen sinks, is among the strongest caustic formulation on the market, the longer it remains in the drain the more drain clogging matter it will dissolve, we recommend that it be allowed to stay in the drain overnight & then flush with hot water, extra heavy plastic bottles, sealed top, child resistant cap & a re-sealable safety storage bag, safe for septic systems when used as directed.