Well, I set here this morning pretty much stumped. This may sound stupid but the only thing I can come up with is the days are longer in July and August which would produce more sunlight for a longer period of time and I would think that might produce more oxygen producing algae. Sounds pretty stupid, when thinking the longer days would produce more heat-hotter water-less O2. And that shows up when comparing afternoon sample verses morning sample. You are just going to have to find someone smarter than me, and that should not be hard to do smile Let us know what you come up with. Most likely something simple lol

Do not judge me by the politicians in my City, State or Federal Government.