DosaPlus 3 is a proportional dosing unit that can be quickly refilled with Poliphos A cartridges. They are designed for installation direct at point of use, under the boiler, to treat water with hardness below 35°. A special brass head and rotary fittings allow these units to be installed either horizontally or vertically. DosaPlus 3 is also equipped with a built in bypass lever that makes maintenance and refilling particularly easy. Designed for use with potable water.