Disposal; Glossary Of Terms - ProMinent DULCOMETER pH/mV/Pt 1000 Mode D'emploi

Disposal / Glossary of terms
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Observe all current locally applicable directives!
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pH value
The pH value refers to a measurement for the concentration (activity) of
hydrogen ions or, in other words, a measurement for the acidity or alkalinity of
water.
The pH value is of great significance in swimming pool water treatment. It
affects:
• Disinfection: the disinfecting capacity of chlorine diminishes as pH rises.
• Flocculation: each flocculent has a particular pH range within which it is
effective.
• Corrosiveness: as the pH value drops, the water becomes more corrosive
towards metallic materials.
• Skin reaction: the acid protection layer on our skin is pH 5.5. Excessive pH
values in pool water attack the acid protection layer and cause skin
irritation.
A pH value that is too low encourages the production of trichloramines. These
cause irritation to the eyes (redness and burning sensation) and mucous
membranes (e.g. coughing).
For the reasons mentioned, the pH value in swimming pools should be
maintained at values between 6.5 and 7.6 (optimum: pH optimum of the
flocculent used). In a private pool where flocculents are not normally used, the
pH value should be between 7 and 7.2.
The pH measurement is, however, influenced by the following factors:
• Chlorination: all chlorinating products alter the pH value.
• The water feed: carbon dioxide (CO
alters the pH value. This effect can be increased by an unsuitable water
feed or by air jets, water agitators or similar.
For all these reasons it is necessary to monitor and control the pH value on a
continuous basis.
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Disposal

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Glossary of terms

) which is emitted from the pool water
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