What is Combiphos?
Inside the Combimate unit are small round crystal spheres, these are Combiphos. This provides the protection to your home. It is made up of a harmless polyphosphate food-grade compound and when added to water prevents scale and stops corrosion. This works by stopping the scale settling on metallic surfaces.
Combiphos also stops corrosion by forming a protective layer on metal surfaces. For example, the inside of pipework and boiler heat exchangers.
However, the Combimate cannot remove existing limescale. Installing the unit will prevent further scaling but the existing scale will need to be removed. It is useful to check for existing limescale before installing the Combimate as limescale can build up in hot water pipes whatever material the are made of, including plastic.