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The weather in California recently turned warm and our plaster, 20,000 gallon pool turned green. Implementing retail store advice including Yellow Out the pool is now cloudy and a light blue color. I have been cleaning the filter cartridge daily - the material in the filter changed from a green...

We need to drain our pool to reduce the CYA level. We also have some patches of algae on the sides of the pool. Is it recommended to spray or treat these patches when the pool is drained or will drying and exposure to the sun finish any living algae? Is all the CYA removed with the water that is...