Drano Build-Up Remover treats your drain before it bes clogged. With a unique formula containing natural enzymes, Drano Build-Up Remover helps prevent clogs from blocking your pipes DIRECTIONS FOR USE: Start-Up Treatment For Drains: Run warm water for one minute. Turn off water and pour 10 ounces into drain. Briefly run WARM water again (approximately 2 cups). Avoid running water for 6-8 hours. For Slow-Running Toilets: 1. Flush 4 ounces down toilet for 3 consecutive days. 2. Don’t flush for 6-8 hours after initial treatment. It may be easiest to treat before going to bed or work. On-going Treatment: Pour 2 ounces down each drain and 4 ounces down each toilet every 2-4 weeks. NOTE: Initial use may cause loosened build-up to slow or, in rare cases, block the flow of water. Don’t worry – this means Drano Max Build-Up Remover is working to remove build-up. Simply plunge and repeat the treatment. For best results: Clear pipes of any clogs before start-up treatment with a DRANO Clog Remover. Use as directed. This product will not open clogs. For clogged drains, try DRANO MAX GEL Clog Remover. Do not reuse this package. USES: Safe for all pipes, toilets and septic systems. WARNINGS: EYE IRRITANT. Contains natural enzymes, bacterial cultures, and surfactants. Avoid contact with eyes, open cuts, or sores. FIRST AID: EYES: Immediately rinse with plenty of water for at least 15 minutes. If irritation persists, get medical attention. KEEP OUT OF REACH OF CHILDREN AND PETS. INGREDIENTS: Water, Enzyme, Thickener, Fragrance, Dye, PH Adjuster. SCJ Formula # 35*4300 Gender: unisex.