Plunge IV is our most economical version of Plunge. This product quickly dissolves heavy grease and fat accumulations in a lift station. The powerful formula dissolves tough build ups on the walls of the lift station and keeps future build up to a minimum. In addition, it removes most sewer odors and gases caused by vertical buildup of grease, fat and magnesium soap. Use this product in wet wells, grease traps, sewage treatment plants, vault toilets and sanitary and storm sewers. Keeps hoses and pumps functioning properly.