AcidBlue uses a full-strength proprietary formula that uses Vapor Reduction Technology (VRT) for safer, easier use than standard Muriatic Acid.Up to 90% of harmful vapors are reduced through this proprietary method that are that are normally associated with standard muriatic acid.AcidBlue cleans, clarifies and etches just like standard 31.45% muriatic acid. Can be used full strength or diluted up to 20.1 depending on the task.Always refer to SDS for safety regulations. Uses; control pH and alkalinity in swimming pools and spas, acid washing pools and concrete, cleaning filters, probes, shower facilities, locker rooms, for the removal of rust, scale and mineral build up. Click on the "Product Details" tab above, to select container size. Must add drum deposit to your cart. Local delivery, Chicagoland area only.