Just out of curiosity, have you actually measured how much power your Hiblow is using? It appears at 6 PSI you are running it at 1 PSI below it's max output of 7 PSI where it looks like CFM falls to zero. At 6 PSI it looks like it is producing somewhere around 1 CFM which is the rated minimum CFM for two vertex diffusers to work properly (just used Vertex for a reference point).
It appears, to me, they rated the Hiblow for 100 watts at ~2.5 PSI. I would be surprised if you were only drawing 100 watts running at ~6 PSI.
I have been surprised many times before though!
On the other hand, the Gast is rated for 3.5 CFM at 6 PSI. Over three times the CFM which might explain the ~3x power required. One thing I have learned through my pond/solar/pump journey is, generally speaking, if it draws less power it's because the pump can do less work.
Last edited by wbuffetjr; 06/12/18 09:27 AM.
