Calculation for flow loss (return 5' above sump)

The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.

Nate C

Aquarium Advice Activist
Aug 16, 2004
Portland, Oregon
Does someone have a link/formula for calculating gph loss relative to lift?

I have a gen-x 4100 (~1000gph) pump in my sump. From the floor of the sump to the return is roughly 5ft. 8O

I know I'm losing flow, but I don't know how much...

fwiw I plan on adding another diy HOB and a 2nd 4100 as soon as possible.

Thanks in advance.

Nate C
Thanks guys-

Also I dug this up from the manufacturers page.



Gen-X submersible pump

1085 GPH
9.2ft maximum lift
UL approved
Ceramic Shaft, adjustable flow
1 year guarantee against manufacturer defects.
PSI Rating 3.98
5/8" and 1" ID Hose fittings included.
750 gallons at 3' Head
650 gallons at 5' Head
Power Consumpion 70 Watts
Top Bottom