Taski Sani Acid is a concentrated Phosphoric acid based limescale remover that contains a corrosion inhibitor. Sani Acid periodic washroom cleaner quickly removes calcium, limescale and urine deposits as well as rust stains from acid resistant surfaces. Phosphoric acid based cleaners such as Taski Sani Acid Heavy Duty Descaler efficiently removes heavy residue whilst still being gentle to the surfaces being descaled.