D Scale from Clean Tabs DESCALES AND CLEANS COMPLETE HOT WATER SYSTEMS REMOVES LIMESCALE AND RUST SAFE TO USE ON STAINLESS STEEL, COPPER, BRASS AND PLASTICS IDEAL FOR HOT WATER SYSTEMS IN CARAVANS, MOTOR HOMES AND BOATS ENVIRONMENTALLY FRIENDLY AND BIODRADEABLE EASY TO USE LIQUID AVAILABLE IN 500ML AND 1 LITRE BOTTLES D Scale is a safe, effective way to remove limescale and rust deposits and to clean the interior surfaces of water heaters. D Scale is non-corrosive and can be safely used on Stainless Steel, Copper, Brass, Plastics and leaves no odour. Periodic use of D Scale in the water heater will avoid mineral deposits building up, so improving the efficiency and extending the life of the equipment. D Scale contains citric acid which is a naturally occurring organic fruit acid especially found in fruits such as lemons and oranges. Calcium carbonate scale builds up layers and hard gritty deposits on the interior surfaces of a water heater. When left without treatment, lime deposits build up and will clog the interior pipes within the water heater, restricting flow and reducing operating efficiency.