8. WATER CHEMISTRY
An incorrect pH level can damage the sur
our pool.
Ideal pH Levels: Concrete Pools: 7.4 - 7.6 Fibreglass/Vinyl Pools: 7.0 - 7.2
A pH of 8.0 makes o
y it is critical to keep your pH in range.
A correct pH level must be maintained to prevent problems such as black spot, staining, cloudy water, etc.
When pH is high you can add Hydrochloric Acid to lower the pH.
When pH is low you can add pH Increaser - sodium bicarbonate (soda ash) to increase the pH.
8.3
pH
Measurement Interval: Once a week
8.4
Total Alkalinity
Measurement Interval: Every 4-6 weeks
Total Alkalinity should not be confused with pH, although the two are closely related. Total Alkalinity determines
the speed and ease of pH change, it is measured in ppm. You should use a test kit which includes a test for Total
Alkalinity. Low Total Alkalinity can cause unstable pH levels. This causes an inability to keep the pH constant and
may cause staining, etching and corrosion of metals. High Total Alkalinity will cause constantly high pH levels.
When Total Alkalinity is high you can add Hydrochloric (a little at a time) to lower the Total Alkalinity.
When Total Alkalinity is low y
er - sodium bicarbonate to raise the Total Alkalinity.
Ideal Total Alkalinity Levels: Concrete Pools: 80 - 150ppm Fibreglass/Vinyl Pools: 80 - 120ppm
22
8.5
Calcium Hardness
Measurement Interval: Every 3 months
Ideal Calcium Hardness Levels: Concrete Pools: 250 - 300ppm
Fibreglass/Vinyl Pools: 150 - 190ppm
I
Total Alkalinity, Calcium Hardness must be kept in balance so that your pool water does not
osiv
face of your pool. These are symptoms of swimming pool water that
is unbalanced.
8.6
Stabiliser
Measurement Interval: Every 4-6 weeks
Ideal Stabiliser Levels: 30 - 70ppm
The importance of pool Stabiliser cannot be over emphasised. It is essential in helping retain chlorine in your pool.
Chlorine is rapidly dissipated by sunlight and the use of Stabiliser will reduce this dissipation dramatically. Without
Stabiliser, it may be necessary to run the unit for longer hours.
THE MOST IMPORTANT NOTICE AND WARNING:
Only add chemical in the method and quantities as indicated on the packaging
provided or advised by your local pool
P
rofessional. Also, if in doubt of any results
you achieve then do not hesitate to consult with your local
pool
Professional.
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