We go out of town often in the summer. If we come back and the pool has a green algae bloom in progress the best thing I've found is, go to the dollar store and get 5-6 gallons of bleach. Pour them all in the skimmer and it will knock the green out in about 12 hours with pump running. It also drops all the dead algae on the floor for easy cleaning.
No $20 bottle of algaecide.
No $20 bottle of drop out.
$5-6 of bleach does the trick in my 22,000 gallon fiberglass.
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