Drano FlowGuard Enzymatic Build-Up Remover and Drain Cleaner – 30oz
Turn off water and pour 10 ounces into drain. Avoid running water for 6-8 hours. For Slow-Running Toilets: 1. It may be easiest to treat before going to bed or work. NOTE: Initial use may cause loosened build-up to slow or, in rare cases, block the flow of water.
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