You mean there is no head loss from a result of height difference but there are still losses resulting from fiction and restrictions which add to head pressure. Power heads on the other hand could be assumed to have zero head loss.

I've found this thread insightful and helped me understand concepts I was completely ignorant of. Mostly the concept of how water height effects head loss, and how water volume does not. My thought process before was more water volume = more weight = more headloss. But it's only water height that does...

Thanks guys :mrgreen:

Isnt it awesome when you go through 5 pages of the same answer as the first page?

oh....and that 27.2" of water colum equals 1 psi.....that is based on fresh water with a specific gravity of 1.....not the approx. 1.25 of our aquariums

LOL, Poor guy that asked the question....is he still here? Sorry I could not help myself..