pH is the key parameter that determines the balance between corrosion and scaling. Low pH (<6.5) corrodes metal pipes; high pH (>8.5) accelerates scale precipitation. The TS 266 range for drinking water is 6.5–9.5. RO membranes usually operate within pH 2–11; because of CO₂, the product water has a lower pH than the feed water and is corrected by dosing if necessary.
Technical glossary· Water quality and measurement
pH
Short definitionThe value that indicates the acidity or alkalinity of water on a scale of 0–14; 7 is neutral, below is acidic and above is alkaline.
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