 Water
Balancing
Controlling the pH of your Pool.
The degree of acidity or alkalinity of water
is measured by it’s pH value. A pH of 7
is neutral; a fall below 7 indicates increasing
acidity, and a pH rising above 7 indicates an
increasing degree of alkalinity.
For healthy pool-water, a pH of around 7.2 –
7.6 should be maintained. The pH of the water
should be measured regularly and adjusted accordingly.
Alkaline Conditions - High pH
A pH of above 7 indicates the presence of alkaline
substances. If the pH value rises above 8, the
effectiveness of the disinfection process is
reduced and the water has an increase tendency
to precipitate hard salt. The water can become
cloudy and the filter capability reduced, due
to blockage.
Acidic Conditions - Low pH
A pH value below 7 indicates the presence of
acidic substances. If the pH falls, the water
becomes increasingly corrosive to metals and
the chlorine level decreases, weakening the disinfection
process.
Finally, and most importantly, if the pH is too
low or high, irritation of the eyes and skin
may be caused by the water.
Ideal pH
A pH in the range 7.2-7.6 is the ideal value
for healthy pool-water.
In practice, it is sufficient to keep the pH
value within an optimum range for each different
disinfectant
pH Adjustments
The chemical(s) needed to adjust the pH depends
on the disinfection being used.
Chlorinated isocyanurates (H2ofun STABALISED
CHLORINE GRANULES) and chlorine gas (which produce
acidic reaction products) are acidic and require
the addition of alkali, usually sodium carbonate
(H2ofun pH plus).
Calcium or sodium hypochlorite (H20fun GRANULAR
SHOCK & H2ofun QUICK DISSOLVE GRANULAR SHOCK)
are alkali and require the addition of an acid,
normally sodium bisulphate (H2ofun pH MINUS).
pH Testing
A simple to use kit is available within the
H2ofun range of chemicals.
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