Alleviate the problem as soon as possible. No sanitizer or very low levels. Algae or bacterial growth may cloud pool water. High pH levels can cause cloudy water. It may also results in lowering the sanitizer effectiveness.
Chloramines can cloud pool water.
Chloramines are formed when nitrogen wastes from swimmers react with the available sanitizer. A high mineral level of Alkalinity, Hardness or Total Dissolved Solids will result in cloudy water. Check with a pool company for testing kits or monitor levels with them. Inefficient or malfunctioning equipment can also cause high turbidity. Filters, Pumps, and Sanitizer Feeders should be checked frequently for proper operation.