Hard water

Effects of hard water: washing machine scale

What is hard water?

Hard water is simply water that contains two harmless minerals - calcium and magnesium, these minerals make it harder for the water to develop a sudsy lather.

Water is considered "hard" if the hardness measures more than 120 parts per million or 7.0 grains per gallon.

60% of water in the UK is considered hard.

Why is hard water bad?