I have issues with Filamentous algae along the shorelines and 3 times a year I physically remove it and take it 200 yards away to the garden. I see a 10-15% reduction annually. I am sure I'll hit the law of diminishing returns relatively soon.
I tried that approach too.
I spent 50 hours digging out tons of algae and dumping it. Within 2 weeks, the algae came back like I had done nothing.
