Proportional dispensers in dust prevent damage caused by limescale and rust in new plants. 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 calcium and magnesium carbonate precipitation up to 70-75 C. The DP1 dispenser can be installed on horizontal, vertical, or oblique pipes and is available in a mirror-polished or sandblasted chrome version.