£15
pH is a measure of how acidic or how alkaline (not to be confused with total alkalinity) the water is.
Description
The pH scale is 0 to 14, with 0 being very acidic and 14 very alkaline.pH 7 is neutral and for spas the pH should be maintained between 7.2 and 7.6,this being slightly alkaline protects the spa and support equipment from aggressive, corrosive water and is comfortable for bathers.
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