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Total Alkalinity This is a measure of the total alkalinity (TA) or how many alkaline substances there are in the water. In swimming pool water, Total Alkalinity, should be between 80 ppm (parts per million) and 120 ppm depending on the interior of your pool. Total Alkalinity is closely related to pH. 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, marble sheen 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 and the chlorine loses its efficiency as a disinfectant. The level of alkalinity in the water is a measurement of all carbonates, bicarbonate hydroxides, and other alkaline substances found in the pool water. pH is alkaline dependent; Alkalinity is defined as the ability of the water to resist changes in pH. Also known as the buffering capacity of the water, alkalinity keeps the pH from "bouncing" all over the place. High levels of alkalinity are lowered by the addition of Hydrochloric Acid or Dry Acid / Sodium Bisulphate. 21 Tip: Low alkalinity is raised by the addition of Buffer/Sodium Bicarbonate.