(4) gallon containers. Dissolves and removes uric acid, a source of bothersome restroom odors and hard water scale buildup in urinals and toilets. Monthly application will remove scale, rust, and other debris from traps and under the flush rim. Urinakleen® will keep urinals flowing freely and eliminate uric acid salt buildup and odors. Urinakleen® contains the acid inhibitor RD-188 for added surface protection.