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Water in general and especially drinking water, is becoming an increasingly scarce commodity in the Central Europe region due to the climate change. For a human, water is a bare necessity of life. The necessary amount of water to maintain human life is several litres a day. However, in a modern way of life, daily water consumption is usually over 100 litres. This amount accounts only for the personal consumption. To ensure the operation of national economy, consumption must be much higher. There are two ways how t...