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How Total Alkalinity effects your pool
or spa ...
The total alkalinity (TA) is a measure
of how much of the alkaline substances
there are in the water. In the swimming
pool water, we are concerned with
bicarbonate alkalinity, which should be
between 80 ppm and 120 ppm.
When the total alkalinity (TA) is within
this range, it prevents rapid pH changes
and "stabilises" the pH level.
If the TA is too low, Marbelite and
plaster walls will become etched, metals
corrode, the pool's walls and floor can
stain, the water can turn green, eyes
burn and we can have pH bounce (pH
rapidly going up and down, seemingly at
random).
If the TA is too high, the pH is
difficult to adjust, the water becomes
cloudy, the pool constantly needs acid
(according to your test kit) and the
chlorine loses its efficiency as a
disinfectant.
It is recommended that you test the TA
regularly, but in practice it changes
very little in a well-maintained pool.
To raise the level of TA, we use sodium
bicarbonate; it is the only chemical
which will do this without increasing
the pH very much. Use the calculator to
find out how much sodium bicarbonate you
need to raise the TA of your pool. Note
that you should only add sodium
bicarbonate at the rate of 1 kg per
50,000 litres of water every 4 days.
Raising the TA can therefore be quite a
time-consuming, slow process.
Lowering the total alkalinity is also a
slow process. Acid, either liquid or
dry, is added to the deepest part of the
pool with the filter off. The acid
should only be added a little at a time,
diluting it before pouring it into the
pool. Wait 3 days between applications.
It could take days or even weeks to
reduce the TA if it is very high. You
should consult a pool professional if
you have a high TA, or you can visit the
Total Alkalinity forum for help on how
to reduce it. The quantities of
hydrochloric acid and dry acid you will
need can be calculated using our
pool calculators.
We answer your inquiries and provide
all the assistance you need pool and
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of professionalism and workmanship
in the industry.
Pool service in the Roseville Areas, Roseville, Rocklin, Granite Bay, Lincoln, West Roseville, Fiddyment Farms Roseville, Crocker Ranch Roseville, Blue Oaks Roseville, Woodcreek Oaks Roseville, East Roseville, Folsom.
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