For human use, water needs to be optimal quality. It contains many organic and inorganic substances that can form harmful compounds under certain conditions. One of many is CO2, which passes into water from the air, dissolves in it and forms week carbonic acid. To some extent, this reaction is optimal for establishing carbonate equilibrium. Water that contains too much carbon dioxide is aggressive and causes corrosion of pipes, valves and other damage to the water supply network. In this research process I introduced the method for determining aggressive CO2 into laboratory work with the validation and tested it on real samples of drinking water in the Celje water supply network.
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