One most frequent material on the surface of Earth is water, the basis of living on the earth.

71% of the Earth is covered by water, about 2.5% of which is sweet water, the rest is seawater that can be found in the seas and oceans. Exclusive of the sweet water reserves in the form of glaciers and constant snow-covers, 98% of the sweet water is belonging to the underground waters that is the reason why the protection of the underground waters is so much important.

Its biological importance is huge, one cannot imagine living on Earth without it, the most part of the cell and bodily fluids is consisting of water.
Water is a chemical material of the greatest importance, it forms the water coat of Earth, fills in the oceans and seas of the world, it is the ingredient of the minerals and stones, the irreplaceable part of the plants and animals.

There is no life without water!

75-80% of the new-borns is consisting of water. About 60-70% of the adults is made up of water, e.g. the body of an adult of 80 kg contains about 54 l water. 78% of the brain, 86% of the blood, 77% of the heart, 84% of the liver, 70% of the muscles are consisting of water.

One drinks more than 1000 litres water a year and 180 litres bodily fluid go through the kidneys a day. Only sweet water is suitable for human consumption, this is the case by the animals and the plants, too.

This move became almost the part of our life in the developed countries.

It is a matter of course that we turn on the taps and the „clear” water is running. We usually clarify the drinkable water from the tap with different water-purifying systems and filter it, so that we can ingest even clearer and healthier water into our organism.

However, clean water is not available for everybody, moreover, it does not exist.

400 million children do not get to healthy drinking water in the world.

On the basis of the survey of the UNICEF, one child die of an illness that is propagated by the water in every second, besides, infected water is the cause of a lot of other illnesses and often of the malnutrition, too.

From the children younger than 5 years, more get sick of the common diarrhoea than of other illnesses. This is the second most frequent reason for dying in this age-group, to which 4500 children fall victim a day. With the improvement of the quality of water the burden of diarrhoeal disease can be reduced by about 40 per cent.