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  2. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    Pure water has a pH of 7 at 25 °C, meaning it is neutral. ... (CO 2) levels exceeding 410 ppm (in 2020). CO 2 from the atmosphere is absorbed by the oceans.

  3. Freshwater acidification - Wikipedia

    en.wikipedia.org/wiki/Freshwater_acidification

    CO 2 from the atmosphere or the decomposition of organic matter affects freshwater acidity. [4] The CO 2 dissolved in water to form carbonic acid. This carbonic acid dissociated into hydrogen ions (H⁺) and bicarbonate (HCO₃⁻), which increases the H+ ions and leads to decrease in pH level.

  4. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    pH in rivers is affected by the geology of the water source, atmospheric inputs and a range of other chemical contaminants. pH is only likely to become an issue on very poorly buffered upland rivers where atmospheric sulphur and nitrogen oxides may very significantly depress the pH as low as pH4 or in eutrophic alkaline rivers where ...

  5. Water quality - Wikipedia

    en.wikipedia.org/wiki/Water_quality

    Many water utilities have developed systems to collect real-time data about source water quality. In the early 21st century, a variety of sensors and remote monitoring systems have been deployed for measuring water pH, turbidity, dissolved oxygen and other parameters. [37]

  6. Distilled water - Wikipedia

    en.wikipedia.org/wiki/Distilled_water

    The pH of distilled water is always slightly lower than 7 (neutral) because distilled water will absorb small amounts of carbon dioxide gas from the atmosphere which forms traces of carbonic acid and lowers the pH of distilled water to around 5.8 pH (very weakly acidic). [13]

  7. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    To kill pathogens and help prevent recreational water illnesses, pool operators must maintain proper levels of chlorine or another sanitizer. [10] [11] Over time, calcium from municipal water tends to accumulate, developing salt deposits in the swimming pool walls and equipment (filters, pumps), reducing their effectiveness.

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