pH/chlorine regulator AUTODOS 5000 - 2005-01-21
Eng_Autodos5000.doc ver 3.2 - page 27
4.1. Wanted Regulation Result
The figure above is taken from the Swedish 'Naturvårdsverket allmänna råd 88:1, bassängbad - vattenkvalitet och
kontroll'.
4.2. pH Regulation
As previously stated the pH value of pool water is a measure of its acid/alkaline balance (pH is actually a logarithmic
measure of free hydrogen ions). Neutral water has a pH of 7.0, acidic water has a lower pH, and alkaline
water a higher pH, a suitable pH value for pool water is 7.4. This choice of a slightly alkaline water is to allow the
production of maximum amounts of the useful free active chlorine and at the same time reduce the risk for skin and
eye irritation. pH value does not remain constant in a swimming pool but is affected by dissolved solids in the water
resulting from chlorine additions and the bathing load etc.
A low pH level can cause eye and skin irritation and give a corrosive water that attacks metals.
A high pH level will reduce the sanitation effect of the added chlorine.
