Hard and Soft Water
Friday, May 13th, 2011Water hardness is something that is often referred to, but not always fully understood. Having hard or soft water in the area can cause problems with appliances in the long run.
Generally, water hardness is measured by the amount of alkaline substances in the water. This is commonly known as the potential of hydrogen value, or pH. The purest water is pH neutral at 7 on a scale of 1 – 14. Soft water is slightly acidic at less than 6.5 pH, while hard water is defined as having a pH of more than 8.5. It is unlikely that any damaging effects would occur from drinking either hard or soft water because it becomes this way through a process of absorbing minerals. Hardened water, such as that found in the south-east of England, travels through chalk or limestone, and may absorb magnesium in some way.
If lead is used at any point in the plumbing system, the gentle acidity of soft water can erode the very soft, malleable metal. In spite of this, soft water is generally more suited to the human body – it feels nicer on the skin and is more tactile when washing. Hard water, on the other hand, causes limescale. This forms around metal and ceramic sinks, baths, taps and in kettles. Limescale build-up can cause significant damage over time, especially in appliances with moving parts, such as washing machines and dishwashers. Water softening tablets are available for use in these white goods and are recommended to prevent long-term problems.