Cold tap water is an indispensable part of everyday life in many households. But why does its behavior change so drastically in summer compared to winter? The difference lies in several factors that influence the aging behavior of the water.
Temperature differences and their effects
The main difference between summer and winter is the outside temperature. In summer, the water temperature in the pipes also rises significantly. This slight warming can accelerate chemical and physical processes in the water. The formation of microorganisms, which grow faster at higher temperatures, is particularly noticeable.
Microbiological activity in water
Water that remains in pipes during warmer months offers microbes ideal growth conditions. These microorganisms can affect water quality and change the taste and smell of the water. Although drinking water should be hygienically perfect through the supply network, high temperatures and stagnant water can initiate local microbiological processes [German Environment Agency, https://www.umweltbundesamt.de/publikationen/ratgeber-trink-was-trinkwasser-aus-hahn].
Standing times and stagnant water
In the warmer months, frequent use and longer periods of non-use of pipes can lead to stagnant water. This stagnant water is more susceptible to the development of microorganisms and to chemical reactions that cause the water to "age". In combination with the higher water temperature, these effects occur much faster than in winter.
Effect on taste
The slow aging of water, especially through chemical reactions such as oxidation, can impair the taste. Although the water is generally not harmful, the changed properties can become noticeable due to interactions with the surfaces in the piping system or the fittings.
Technical causes of "aging" in summer
The physical state of cold water changes with rising outside temperatures. At higher temperatures, water has a lower solubility for gases such as oxygen, which in turn can lead to a higher concentration of dissolved minerals and salts. These changes in concentration not only promote deposits but also the growth of microorganisms [Technische Universität Dresden, https://tu-dresden.de/].
How to avoid the aging process
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Regular use: It is advisable not to let the water stagnate for too long to minimize the formation of microorganisms.
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Filter water: The use of filtration systems such as those from Klar2O can help keep water fresh and taste-stable even in summer.
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Correct storage and flushing: In households with unused pipes, it is advisable to let the water flow regularly to avoid stagnant water.
Conclusion
The aging of cold tap water in the summer months is a natural process favored by a variety of factors, from temperature differences to stagnant water. A conscious approach to water, particularly through regular use and targeted filtration, can help minimize these effects and keep drinking water quality stable.
