Clean and eliminate odors on contact! One drop-in dissolves instantly, safely treating a 40-gallon holding tank. Cleans, deodorizes, disinfects. All in one holding tank chemical. Stops odors on contact. Kills odor causing germs and retards the growth of new bacteria. Contains coconut oil, soap oil and system lubrication. EPA registered. No blue dye stains, no poisonous formaldehyde and biodegradable.