The combination and structure of rare earth metals in this product are designed to create water turbulence so that any water hardness (eg Calcium Carbonate) will come into contact with them and a chemical reaction will be catalysed, resulting in only soluble forms being present in the water.
This is to eliminate glass spotting, shower rose clogging and water cylinder issues.
The unit has 1 inch (25mm) BSP thread and connects directly to the incoming main cold water supply.