Hard water isn't always a problem but when it comes to households it can have unpleasant side effects. For example, it can be hard to wash in as soap doesn't lather up as well and can also leave scum on surfaces. Cleaning can also become difficult as some detergents become less effective, consequently clothes end up looking dirty after being washed and dishes and glasses can become dull over time.
As well as all of the problems on the surface, limescale builds up in places you can't see. Past 55°C the minerals in hard water solidify when evaporated causing problems with your heating system and appliances. On average, hard water contains 300mg of dissolved minerals per litre. Therefore a four person household can obtain up to 70kg of limescale a year. If left unchecked it can clog up pipes and boiler heat exchanges, resulting in reducing the heating efficiency, decreased water pressure and flow rates. This will increase the houses demand or energy, leading to higher energy bills and maintenance.