That epilimnic water is high in O2, but it's also going to be high in BOD at the same time from all the phytoplankton. The net effect may not be so positive if the pond or lake is much deeper than the sechi depth since all that phytoplankton is going to start breaking down and consuming O2. Plus the water is directly injected into deep water instead of drifting in a lateral direction before sinking more slowly as in traditional aeration techniques.
Hmmmm a 20 acre lake with a very small hypolimnion could be aerated with a straw. That marketing point isn't carrying a lot of water with me until I see 20 deep acres.
The pumps they are using are ultra efficient low-head pumps like they use in water park "lazy river" streams.
My first reaction is we are seeing something using a different approach for about the same results, but with design flaws I commented on above. I think it's all about marketing, but time will tell. It is easier to sell something that looks different but accomplishes the same goals, than it is to sell just another aerator, even if that aerator is better.
