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Alkalinity
Total alkalinity is the measure of the amount of alkaline buffers (primarily
carbonates and bicarbonates) in your water. These alkaline substances buffer the
water against sudden changes in pH. Total alkalinity is considered the key to
water balance. It is the first parameter you should balance when making routine
adjustments to your water.
If you neglect to check the total alkalinity in your pool or spa, you may
have trouble balancing the pH. You may also notice that pH fluctuates suddenly
despite your best efforts to keep it in the ideal range. If the alkalinity is
too low, anything introduced to the water will have an immediate impact on pH.
Abrupt shifts in pH can cause scaling or corrosion of metal equipment and
fixtures as well as other problems. When the total alkalinity is high, the pH
has a tendency to drift upward, causing scale to form.
Maintaining an ideal level of alkalinity will protect your pool or spa and
its equipment from the harmful effects of sudden pH fluctuations. Think of the
alkalinity as training wheels: it keeps the pH in balance without allowing it to
tip too far to either side. Of course the pH can still drift upward or downward,
but that change will happen gradually as long as the alkalinity falls within the
ideal range. The ideal range of total alkalinity for pools and spas is between
80 and 120 ppm (mg/L).
When the total alkalinity is too low, add sodium bicarbonate. If the total
alkalinity is too high, you can lower it by using muriatic acid or sodium
bisulfate.
For more detailed advice on the specific chemical treatment for your pool or
spa, contact your dealer.
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