MuddyFork, I installed Vertex Air 1 with 2 diffusers about 6 weeks ago. At the time I had large floating algae mats covering 60% of the surface of my 35 year old .75 acre pond and over 4' visibility. I run the system 24/7. The algae mats are GONE (small bits float up now and then) and my vis has dropped to 22 inches (using a white teacup on a string method. The water has a faint green tint to it. Pond is 4' deep in one end and 8' at the dam. The backside of the dam is about 14' high so I believe I have a reasonable expectation that there is at least a few feet of accumulated muck on the bottom. Lots of trees in immediate area to support that theory also.

PETA, People Eating Tasty Animals