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What Makes Water Hard?

Acid in rain
Most people have heard of acid rain produced by absorption of sulphur and nitrogen oxides by rainfall; however, the presence of pollutants like these gases is not the only source of acidity. Carbon dioxide constitutes 0.3% of the Earth's atmosphere, and is readily absorbed by water to form carbonic acid - the acid found in carbonated beverages. Therefore, all rain is acidic to some extent, and has a strong tendency to dissolve minerals and rocks with which it comes into contact. Water is a good solvent and gathers impurities easily. Pure water, which is tasteless, colorless, and odourless, is often called the universal solvent. As rain falls it becomes slightly acidic as described above. As the water travels through soil and rock, it dissolves small amounts of minerals and holds them in solution. As already mentioned, Dissolved calcium and magnesium in water are the most common causes of hard water. The level of hardness increases as the magnesium and calcium increases.

Below is British Standard 7593: 1992 as used in the UK and this categorises
mains water supplies as follows:

Designation Hardness Concentration mg/Litre (as CaCo3)
Soft 0-50
Moderately Soft 50-100
Slightly Hard 100-150
Moderately Hard 150-200
Hard 200-300
Very Hard Over 300

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Introduction | What Makes Water Hard? | Is Hard Water Bad For You? | How You Can Know If You Have Hard Water
Limescale | Effects of Limescale | Effects of Hard Water | Various Methods Of Water Treatment | A Quick Guide to Common Water Treatment Devices | Benefits of a Limescale-Free House