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Total Alkalinity. 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.ote 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.
Now you might have a swimming pool reading of 7.2 pH, but if total alkalinity is low, the pH of 7.2 can be easily moved too acid or too alkaline. It can be pushed around because the total concentration of (-) ions (the total alkalinity) is low. Hence, pH can get pushed around and will not stay put. This same thing happens with humans. pH values can get pushed around fairly easily if total alkalinity is low. Some refer to this as mineral reserve. The key is to balance pH and increase total alkalinity levels.