Thanks. I read through some of those alum threads. I have 5.5 acre-ft of volume. That's 2500 lbs of alum and lime to acquire, haul, mix, and apply. That's well beyond my capability. Seems a lot easier to spray a few gallons of MetaFloc, which includes flocculation.
My water is very clear, not muddy. No clay turbidity. Just elevated phosphorous.
I would be VERY interested in seeing water test results from pre application and comparing it to post application. SRP and TP readings pre/post.