Dosing Kit + Filtration Very high-resistance plastic filter + dispenser. Integrated 5-function system: 1 – Filtration with a washable net (50 micron). Stops suspended materials with the creation of a water vortex. Unload the filtrate simply by opening the practical drain cock. 2 – Proportional dosing device for silicopolyphosphates against limescale and corrosion. 3 – Anti ram hammer installed on the filter cartridge. 4 – Non-return valve on filter. 5 – Non-return valve on doser. The BIOPHOS SYSTEM is the smallest complete water treatment plant which allows the installer, based on the UNI 8065 standard, to release the certification for the hydraulic system. The connection sleeve between the filter and the doser is included. PN16.