Proportional powder dispensers prevent, in new systems, damage caused by limescale and rust. In old ones, they create a protective film around the pipes to prevent corrosion due to years of erosion by water. Thanks to the Venturi system, the dosage of the polyphosphates is proportional to the flow of the water supplied, ensuring a precise introduction of the product. Micro-dosing of the polyphosphate neutralises the precipitation of calcium and magnesium carbonate up to a temperature of 70-75°C. The DP5 dispenser can be installed on horizontal, vertical or oblique pipes.