Why is my pool milky blue?
Mia Lopez
Updated on March 07, 2026
Cloudy Pool Water: Causes, Treatment, and Preventive Measures. Cloudy or milky swimming pool water is caused by seven main issues: improper levels of chlorine, imbalanced pH and alkalinity, very high calcium hardness (CH) levels, faulty or clogged filter, early stages of algae, ammonia, and debris.
How do I fix blue cloudy pool water?
A pool clarifier works with any filter type and works best with milder cloudy water issues.
- Skim, Brush, and Vacuum Your Pool. Remove large debris with a heavy-duty skimmer. ...
- Test and Balance Your Water. ...
- Shock Your Pool. ...
- Run Your Filter 24/7. ...
- Increase Your Pool Circulation. ...
- Add Pool Water Clarifier.