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Cloudy Water In A Pool

There are 3 possibilities for cloudy water in a pool:


  • Low water temperature
  • DE powder in pool
  • Algae

1)  If your pool water is above 70 degrees F, it isn't cold enough to cause cloudy water.

2)  If you have a DE filter, break it down to check for broken grids

3)  If the water temp and filter are not issues, the cloudiness is most likely an early algae bloom.

Items needed to eliminate algae:


Confirm all water parameters:

pH - 6.6 - 7.0

Copper- .4 ppm - .7 ppm

Calcium - 400+ppm (minimum 300 ppm)

Phosphates - 0 (maximum 200 ppm)

To Eliminate Algae:

1)  Begin lowering the pH to 6.6 - 7.0.  (Aim for 6.6)

2)  Apply 1 quart non-metal algaecide during daylight hours.  If possible, apply the algaecide in the morning which is when algae feeds.

3)  Wait 12 hours.  Then put in non-chlorine shock (potassium monopersulfate), using the formula 5 lbs per 20,000 gallons of pool water.  

4)  Wait 24 hours.  If the pool isn't 90% clear add another dose of the non-chlorine shock.

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