What type of test is used to measure the total alkalinity of pool water?

The total alkalinity of pool water is measured using a titration test. This test involves adding a reagent to a water sample that reacts with the bicarbonates and carbonates present in the water. As the reagent is added, the pH changes, and the point at which the pH reaches a certain level indicates the total alkalinity. This method is effective because it quantitatively assesses the buffering capacity of the water, which is essential for maintaining stable pH levels in the pool.

Other methods, such as colorimetric tests, are typically used for parameters like chlorine levels or pH but do not specifically give a direct measurement of total alkalinity. Conductivity tests measure the ability of water to conduct electricity and are more related to the concentration of ions in the water rather than alkalinity. Pressure tests are not relevant to chemical composition but might pertain to equipment performance in an aquatic setting. Therefore, the titration test is the correct and most appropriate method for determining total alkalinity in pool water.