That's a seriously nutrient rich lake. You might want to also talk to the property owners about reducing their use of lawn fertilizers as well. Aeration could help some too. Even killing off just a quarter of the stuff would have me worried about an O2 crash. Yikes. I would try to manually remove as much of it as possible first.
12 ac pond in NW Missouri. 28' max depth at full pool. Fish Present: LMB, BG, RES, YP, CC, WB, HSB, WE, BCP, WCP, GSH.
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