Does the AS39 eliminate the limescale from the water?
Unlike water softeners, the AS39 does not chemically alter the water. This means that the minerals are all still present. When the water is heated the minerals will form as powder. In most cases, this is washed away with the flow of water.
However, if the flow rate is low, then a small amount of this powder can build up over time, for instance in the bottom of a hot water cylinder, with the amount depending on the flow rate, hardness of the water and system configuration. If desired, this powdery residue can be dealt with by an occasional drain down or cleaning of the system.