Correct, single Vertex diffuser, pumping WAY more air than it was designed for, in excess of 5 cfm. I figure the guy that owns the pond can't get mad at me. grin

Yes, I'm more concerned with O2 levels than temps *to a point*, as I have RES in the pond. But, the RES I have seem to be doing OK with these temps.


www.hoosierpondpros.com


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