Proportional dispensers in powder prevent damage caused by limestone 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 the precipitation of calcium and magnesium carbonate up to a temperature of 70-75°C. The FERRARI DP1 dispenser can be installed on horizontal, vertical or oblique pipes and is available in mirror-polished or sandblasted chrome. This model’s peculiarity is the possibility of a double function: the dispenser can be bypassed, or the water can be stopped entirely. Refilling the polyphosphate is possible through the rotation of the valve control butterfly, excluding the dispenser alone or even the appliances to which it is attached.