DRAINO CLEAR CRYSTALS is a powerful, highly alkaline compound for sewer and waste disposal lines, drains and grease traps. Unstops lines by chemical actions. Recommended for preventive maintenance to avoid sewer stoppage and back up. Indispensable for schools, food processing plants, factories, restaurants and institutions. Converts grease waste into soluble products, which can be flushed away. Remove chicken feathers from poultry plant drains. Will not inhibit bacterial action in septic tanks or sewage treatment plants, when used as directed.