The quality of life depends on water quality, and the person on two thirds consists of water. Contains in various tissues of her human body from 22% to 99%. What is a hard water and what problem it can represent for the person?
Hardness of water are defined by content calciumand magnesiumof salts in it. These substances, in turn, contain in limy breeds. Respectively, in those areas where limestone is a lot of, limy breeds and soils, water - the increased rigidity. Therefore in regions Volga region, the North Caucasus water of the increased rigidity, in the Leningrad Region where soils don't contain limestone, – soft. Passing through the soil, water washes away salts of calcium, magnesium, and in such look comes to a water supply system. At the content of salts of rigidity (calcium and magnesium) of less than 2 milligrams on liter water is considered soft, from 2 to 4 milligrams on liter – normal rigidity and suitable for cooking and drink, from 4 to 6 milligrams – rigid, and over it is very rigid. Distinctive properties of such water: it is saltish and toothsome, in it detergents are badly dissolved, but the most unpleasant is that it promotes formation of stones in kidneys and a pancreas. As the washing substances contain alkali, in interaction with salts of a hard water when washing, washing is formed the deposit covering with a film of a surface of plumbing, ware. The film isn't washed away from the surface of skin when washing, hammers its time and causes irritations and the naggers. When heating in a hard water crystals of salts of rigidity which settle on teapot walls, on a surface of a heating element of the washing machine are formed. In regions where water of the increased rigidity, note high percent of diseases of an urolithic disease, formation of stones in a pancreas. In the household ways of softening of water are boiling (for water in the food purposes) and addition calcinated soda (for washing). When boiling the hydrocarbonate of calcium breaks up to the carbon dioxide and a carbonate of calcium which is dropping out in the form of a deposit. Water after boiling is settled and filtered. To soften water for washing, add two teaspoons of soda on a water bucket, stir, wait for loss of a deposit and drain water, having left a deposit at the bottom. Industrial ways of softening of water are: reagent (similar to household, comes down to addition of alkalis), ion-exchange (with use of pitches which ions are replaced with ions of hardness of water).