Combiphos is the name of the crystal spheres used inside the Combimate unit. They provide the protection that Combimate gives to your home.
Combiphos is a harmless food-grade polyphosphate compound, that when added to water, prevents scale and stops corrosion. It achieves this by inhibiting the deposition of scale onto metallic surfaces.
Combiphos also inhibits corrosion by forming a thin protective layer on metal surfaces (e.g the inside of pipework and boiler heat exchangers) . A Combiphos concentration of 2 -3 ppm (parts per million) is sufficient to achieve both of these effects.
Existing hard scale, i.e calcium carbonate, cannot be easily removed by Combiphos. In these installations, Combiphos will prevent further scaling up. Limescale can build up in all untreated hot water pipes and systems whatever material they are made of, including plastic.