Green Water In A Pool

Items needed to determine the cause of green water in a pool:

1)  Test Phosphates.  If they are present use a recommended phosphate remover.

To Eliminate Algae:

1)  Begin lowering the pH to 6.6 - 7.0.

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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