Limescale Remover DS-3 is a powerful but environmentally friendly product which is ideal for use to remove baked-on limescale deposits from domestic appliances and boiler heat exchangers. Designed with the consumer in mind, the product is safe and easy to use; after each application the product changes colour to indicate when DS-3 is exhausted and ready for disposal to foul drain. Fernox DS-3 is used for removing limescale from any type of water heater to restore its efficiency. It is safe to use with steel, stainless steel, cast iron, copper, brass, PVC, ABS rubber polythene and most plastic pipework. Limitations: It should not be used with thin gauge or badly corroded aluminium, zinc, galvanised steel, acrylic (e.g. plastic kettles and baths) chromium plated or enamelled surfaces (e.g. baths), concrete and asbestos. When in doubt, check with the appliance manufacturer. Restores efficiency to all types of water heater Powerful acid limescale remover, dissolves up to 50% of its own weight of limescale Corrosion inhibited formulation Colour change indicated when exhausted Safe to apply and easy to use Belgaqua approved Fernox DS-3 should first be dissolved in hot water at the maximum concentration of 1 kg per 10 litres of water (10%) with a minimum in-use concentration of 250g per 10 litres of water (2.5%). Hot water will accelerate de-scaling, but do not exceed 80°C. The de-scaling process will release carbon dioxide gas (CO2), which can cause foaming. Hence, space should be allowed for this before commencing work. A colour change from yellow, through green, to blue indicates the de-scaling power is exhausted. However, the major part of the solution’s effort is expended when green is reached and if cold the final change to blue can take a long time. When de-scaling is complete, drain and rinse several times until no traces or odours remain.