Camco's TST Blue Enzyme RV Toilet Treatment is a great way to keep your RV toilet clean and free of odors. This RV toilet treatment contains an enzyme complex that digests waste, tissue, fats and proteins. The enzyme complex is activated when diluted, and the ultra-concentrated formula just 4 oz. treats up to 40-gallons. TheEnvironmentally Friendly: All components are biodegradable and septic sa TST Blue Enzyme RV Toilet Treatment also stops odors for up to 7 days.