gph? little giant pcl-020 please help

gph

gph

If you click on the link you provided and then click on product data sheet (performance) scale down to page two and it gives you gph at head loss ex: 1ft 300 gph
 
You will find most of the pumps used with any frequency here
http://reefcentral.com/calc/hlc2.php

How big a tank are you tring to use this on? A sump with skimmer should have about 3 to5X turnover. That pump at 3' looks to be about 275Gph anyway, you should make sure it is rated for "Marine" use. Some pond pumps have shafts that are not very good in salt water is all.
 
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