Water purification

Hard water

Water described as “hard” has high mixture of dissolved ores, specifically calcium and magnesium. The hard water is not hazardous to our health, but it creates trouble such as mineral formation on fixtures and poor execution of soap or detergent. Water is a good solvent and takes impurities easily. Pure water is insipid, colorless, and odorless and it is often called the universal solvent. When water is combined with carbon dioxide to form very weak carbonic acid, still better solvent results. When water moves through the grounds and the rocks, it dissolves a very little quantity of ores and holds them in solution. The presence of calcium and magnesium in water are responsible for the hardness of water. The hardness of water becomes larger as the magnesium and calcium contents increase.

The hard water is the water which has a high content of minerals. These contents are usually composed of the high levels of the metal ions, mainly of calcium and magnesium in the form of carbonates, and can also include several other metals such as bicarbonates and sulphates. They are not generally dangerous to our health. The easiest manner to determine whether the water is hard or soft is the foam test. If water is very soft, the soap will tend to foam easily when agitated, while with hard water it will not. The toothpaste also will not make foam in hard water.

Hardness in the water can be classified in to temporary and permanent hardness. There are also common types of hard water based on the ion content in water. Temporary hardness is a hardness which can be removed by boiling or by adding lime. It is caused by a combination of calcium ions and bicarbonate ions in water. Permanent hardness is a hardness which cannot be removed by boiling. It is usually caused by the presence of calcium and sulphates and also by the magnesium chlorides in water, which become more soluble while the temperature rises.

The hard water is not hazardous to health. The drinkable hard water generally contributes essential amount of calcium and magnesium towards the total human dietetic needs. The use of hard water creates many difficulties such as clothes which are washed out of hard water are felt hard and strident and looks very dull. The hardness ores combine to form insoluble salts makes them difficult to remove. To wash the cloth continuously out of hard water can shorten the life of clothes. When we bathe with hard water foams of the soap will stick in our skin. This makes difficult to retain our normal condition, slightly acid state, and can lead to irritation. This makes our hair to lose its shining and becomes difficult to manage.

When washing dishes, particularly in a dishwasher, the hard water can cause stripping on your crockery. The hard water also contributes to the ineffective and expensive operation of water-employing apparatuses. Heated hard water forms a lime scale deposits which can results in the ineffectiveness or failure of the water-employing apparatuses. The pipes can be blocked with the lime scale deposits which reduce the flow of water and finally results in the replacement of pipe.