This Limescale Cleaner comes in 5 packs per box. It is a natural cleanser made from Citric Acid that is safe, food grade, and odorless. It can easily and efficiently remove limescale from different appliances with just adding water. Limescale is a hard chalky deposit, consisting mainly of calcium carbonate, that often builds up inside kettles, hot water boilers, and pipework, especially that for hot water.