8. WATER CHEMISTRY
8.3
pH
Measurement Interval: Once a week
Ideal pH Levels: Concrete Pools: 7.4 - 7.6
Fibreglass/Vinyl Pools: 7.0 - 7.2
A pH of 8.0 makes oxidization only about 26% efficient which is why 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. An
incorrect pH level can damage the surface nish and walls of your pool.
When pH is high you can add hydrochloric acid to lower the pH.
The TDS level
SHOULD NOT
go below 700ppm.
Low TDS levels (<700ppm) will destroy the coating on
the OXI Cell and void the warranty.
NEVER ADD SALT DIRECTLY TO THE SKIMMER BOX.
This high concentration of salt will pass through
your ltration, pump and other pool equipment.
HANDY TIP:
The colder the water the lower your output but this does not mean you need more salt.
The unit can operate on mineral/magnesium chloride salts and you should add 20-30% more than
traditional salt.
Salt/Minerals should always be added to the shallow end of the pool and allowed to dissolve. Do not let
them settle on the oor of the pool as this may cause damage to the surface. Use your pool brush to mix
the salt/minerals into the water.
Running the pump will mix the water and help the salt/minerals to dissolve.
8.4
Total Alkalinity
Measurement Interval: Every 4-6 weeks
8.2
TDS Levels Measurement Interval: Every 4-6 weeks
Ideal TDS Levels: 800-1000ppm and no more than 1200ppm.
Although the TDS is not consumed by the System, TDS is lost during backwashing, pool over ow, heavy rainfall,
splashing and on bathers that use it. The correct TDS level allows for the most efficient production levels, electricity
consumption and freshest possible water.
Ideal Total Alkalinity Levels: Concrete Pools: 80 - 150ppm Fibreglass/Vinyl Pools: 80 - 120ppm
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 acid (a little at a time) to lower the Total Alkalinity.
When Total Alkalinity is low you can add sodium bicarbonate to raise the Total Alkalinity.
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