Just to add more info than was sent in the PM.

Winter diffusers should be set 1/4 to 1/3 total pond depth and in areas where anything that goes swimming can get back out of the water without having to climb up on the ice. I almost lost my 2 dogs that way a number of years ago because of having it too far out from shore.

Coarser bubbles are better for winter aeration, finer bubbles are better for summer aeration. It's the water surface movement that keeps the pond open in the winter, and larger bubbles make more ripples/waves than small bubbles.

In the one pond that I have observed winterkill in that had an aeration system running, fish aren't smart enough to seek out areas of higher dissolved oxygen. So, in marginal ponds, I'd suggest more diffusers rather than less, especially in ponds that get a thick layer of snow which prevents sunlight from making it's way into the water thru the ice/snow layer.


3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).