Hard water is a problem that can be solved by fitting a water softener.
Hard water is water which contains large quantities of calcium and magnesium and causes problems in our households for two main reasons. It causes scaling in kettles, water heaters, tanks and pipes and so on. The scaling causes a reduction in conductivity and blockages in pipes. Hard water also reduces soap lathering and thus makes showering and bathing difficult.
Very simply, the water softener replaces the calcium and magnesium ions with sodium ions.
Water softeners in London are best located near the mains supply, their fitting will reduce incoming pressure by 0.5 to 1.0 bar.