Directions For Residential Main Line Drains: 1. Pour entire bottle into any first floor toilet. 2. Simply flush once to distribute product through pipes. Note: Best if used during low usage time, such as nighttime. Recommended to not use water for several hours after application. For Sinks & Tubs: 1. Pour 1/2 to 1 Quart slowly into drain. Allow to work for 30 minutes. 2. Flush with hot water. Note: For extra tough clogs repeat treatment and allow to sit in drain overnight. Flush again with hot water in the morning.