I have a similar situation at my pond. I added a venturi to my main line-also 2"- to suck a bit of air into the low DO water, but I don't want my temps equal top to bottom. Mine is about 11.5' at the deepest, full-pool and my main line comes in and is anchored in 7' coming straight up about 1' off of bottom. I can also run 120gpm open flow and it's quite a boil.
I still decided it best to buy an aerator and run night cycles only in the heat. I think it's helped my water quality substantially.


Edited by Snipe (07/06/19 06:18 PM)
_________________________
I Subscribe!