We picked up a MagDrive 7 (for the sump), a 100A Top Fathom Skimmer, and a MagDrive 3 for the skimmer.
The return pump is a AquaClear 802 PH
that has been there (and running) for about 6-7 years and the flow seems pretty weak to me so we were going to use the Mag7. Got the pumps switched out and fired up the new Mag7. That thing really cranks! The problem is that my overflow can't keep up with it. More water is being pumped into the tank than is able to flow out.
The large hose that runs from the bottom of the overflow box, on the back of the tank, to the sump has a fairly large dip in it so water flows out of the box, down near the floor, then back up about 7-8 inches to the sump. I'm thinking that that is the problem. If I shorten the hose to eliminate that "dip" the water will have more of a straight shot down and it should increase the flow. Does this make sense or is the Mag7 just to darn powerful?
My other option would be to use the Mag3 for the sump and the Mag7 for the skimmer?