It all depends on the Ortho P reading how much you need. If you can get alum and hydrated lime, I'd look into going that route first due to costs involved. Price PhosLoc and you'll see what I mean. I know PhosLoc is slightly different than alum/hydrated lime, but I'd like to see an honest side by side test to show whether PhosLoc works better.

It's calculated on acre foot of water, not strictly surface acres.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).