That bottom DO has really moved up. Any ideas why - should be at about its yearly low.
I think it has something to do with increased movement of the ground water through the pond. That movement mixes the higher D.O. water that lies 12-18 inches off the bottom with the bottom water. When I take the bottom D.O. readings they are truly taken on the bottom. 12-18 inches above the bottom the D.O. is quite a bit higher.
