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All non-para products contain blue blocks with cleaners and/or enzymes, that clean & deodorize with every flush. Safe for use in septic systems. Biodegradable, chlorine-free, non-toxic, non-corrosive. Leaves water a blue tint with each flush. Designed for use inside all toilet with reservoirs. Helps prevent scale build up. For use in restrooms, schools, hospitality, health care, industrial.