Question

You test the pool water and observe that the calcium hardness is too high. What chemical should you add to lower calcium hardness?

A) Muriatic acid directly over the main drain
B) Sodium Bicarbonate
C) Calcium Chloride
D) You do not need to add any chemicals. You must drain water from the pool and replace it with fresh water to lower the calcium hardness.

Answer 1

To lower calcium hardness, you must drain water from the pool and replace it with fresh water.

Step-by-step explanation:

To lower calcium hardness in the pool water, you need to drain water from the pool and replace it with fresh water. This is because calcium hardness is a measure of the concentration of calcium ions in the water, and the only way to lower this concentration is by dilution with fresh water. Therefore, option D is the correct answer.