help with water pumps

JOSH · #1 10-17-2006, 10:57 PM

ive been looking at getting a water pump but i want to know what they mean by this on JL aquatics

Flow Rate at 0' Head: 200GPH
Flow Rate at 4' Head: 125GPH
Flow Rate at 6' Head: 15GPH

mr_alberta · #2 10-17-2006, 11:13 PM

That's the flow from the pump at the given head pressure. So, using your example below, the pump pumps out 200gph normally. Now if you had to pump water 4' straight up, the output drops to 125gph due to pressure and friction within the pipe.

kwirky · #3 10-17-2006, 11:59 PM

can you post a link to the pump you're looking at, and explain how you're going to be using it?

mark · #4 10-18-2006, 12:10 AM

Below is a great summary of lots of pumps all on one page, the more info is flow/head plots.
http://www.reefs.org/library/pumps/

JOSH · #5 10-18-2006, 03:11 AM

dont really have a pump in mind yet, but its just gong to be a return pump from my sump

kwirky · #6 10-18-2006, 04:28 AM

what size is your tank? what size is the overflow (the drain) drilled for in your tank? what size is the return drilled for (for the pump)?