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The level of alkalinity in the water is a measurement of all carbonates, bicarbonates, hydroxides, and other alkaline substances found in the pool water. pH is alkaline dependent; that is, 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. Low alkalinity is raised by the addition of a base (similar to pH). High levels of alkalinity are lowered by the addition of an acid (similar to pH). Adding an acid will lower both pH and alkalinity. A very important component of water balance, alkalinity should be maintained in the 80-120ppm range.
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