Noel,

I'm trying to make sense of this chart that came with my pump. If I'm understanding it, at 1.0 CFM (there's only one solid line) the pump is creating 7.9 psig. Without an air pressure gage, I've no idea what the pump is generating. So going with depth of 8.5', that's 4.25 psi on the diffuser. 50 ft of 3/8 line may create 1 psi, leaving 1.75 psi in excess, so I think I'm pushing some pretty reasonable air.

Looking at your vertex info sheet on diffusers, I'm not sure if I should compare to the single or double diffuser info. Mine is a double diffuser, but being tubular, I'm sure there is some variance as compared to a disk. For the sake of argument, I'll go with the single diffuser data.

At 8 feet, if I'm actually getting 1250 gpm of lift, that's 75000 gph. With 187000 gallons in the pond, I'm moving every bit of the pond in just under 3 hours. Everything being pure speculation.

Temp readings at 6pm registered 2 degrees difference between 20" and 10.5' (90 & 88 respectively). We've had cloud cover and rain on and off most of the day, so that contributed to the 1 degree drop at 20".

At this point, my question is still...how warm is too warm for both the fish and the pond as a whole?

Fish seem to be happy and fed like pirahna today.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!