Most commercially available (and expensive) solvents for sonic cleaners were developed for use on jewelry, dental materials, or greasy bearings; they work poorly on salty scuba gear! Global's solvent, based on a food-grade organic acid, was especially designed to remove the deposits which contaminate dive gear. This 16oz bottle mixes with water to create one gallon regular strength Hydrosonic Cleaner. Ships HAZMAT at additional cost.