Powerful sodium hydroxide formula for severe main line blockages — fast-acting and reliable.Red Crown Clog Destroyer is designed for main line blockages in commercial and residential settings. Quickly dissolves grease, fat, and organic debris to restore flow in tough main drains.Best for:• Main line drain clog removal• Commercial and residential drain maintenance• Outdoor and underground drain linesImportant: Not for use in standard indoor plumbing fixtures (sinks, tubs, showers) or with aluminum or soft-metal pipes. For indoor drain use, see our Firewater Liquid Drain Opener.Features:• Potent sodium hydroxide formula• Rapid-acting on severe clogs• Non-acid, corrosion-resistant• Available in jar or bag options• Fast shipping in the USASafety:Always use gloves and eye protection. Follow all usage instructions carefully.