Looking at these but after using a chart for head loss (for the 6000 model) it seems my GPH
drop from 1500/1600 to 750 ish. Not sure if the chart I used is correct or not. Looking for some opinions on this pump. The noise it makes is also a huge factor because my sump is under the tank. I'd rather spend more money if I have to than to go with something I won't be happy with. Hoping you guys can help! I've also looked at pan world, and Iwaki pumps but I'm afraid they will be loud according to some reviews I've read.