Very minor green alage in corners of pool

Algae in a pool should use the process SLAM Process.

Those areas are most likely 'dead' zones and need to be brushed often. Also maintaining your FC a bit higher on the scale shown in [FC/CYA][/FC/CYA] may be useful. With a SWCG, I would suggest maintaining your FC at 10% of CYA after you complete the SLAM
 
As stated above, the SLAM process will eradicate the algae so hopefully it doesn't come back again. Ever.

But there's got to be a reason it has been coming back. Are you maintaining high enough [FC/CYA]chlorine levels[/FC/CYA]? Maybe you need more CYA to prevent sunlight burnoff? Do you have poor circulation? Insufficient brushing? Some test results would help us diagnose things.
 
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