184.108.40.206 The resin is coated in sodium ions, which have a positive charge. The magnesium and calcium have a stronger positive charge and so displace
the sodium ions. The sodium ions dissolve into the water- this hard water is softened using this method.
5.1.3 washing powder
220.127.116.11 creates a scum and removes the calcium and magnesium ions.
5.2.1 can be boiled to soften. Creates CaCo3
(s) which is limescale.