Quick answer: High pH reduces chlorine effectiveness and encourages cloudiness and scale build-up. Lower it gradually according to the instructions, not with one large dose.
pH is one of the most important water values. If it is too high, disinfection works worse and the owner feels they constantly need to add more chemicals.
How to recognise high pH
Typical signs are cloudy water, weaker chlorine effectiveness, eye irritation and scale deposits. But only measurement will confirm it.
- milky cloudiness
- scale on walls and equipment
- higher chlorine consumption
- worse feel of the water
How to lower pH
Use a pH-minus product according to the water volume and the manufacturer’s instructions. After dosing, let the water mix and measure again.
- dose gradually
- turn on circulation
- do not mix chemicals dry
- measure after mixing
- also watch alkalinity
Why pH keeps rising back
pH is affected by the source water, alkalinity, hardness, aeration, refilling and some types of chemicals.
Related guides
This article is original editorial guidance by Spa Pool News. For chemicals, electrical equipment and service work, always follow the manufacturer’s instructions and safety recommendations.
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