One follow up ?. I'm looking at getting a new overflow box that would be rated at about 1200GPH. If my current return pump is only going to get me about 800GPH with the head loss, will that still balance out?
It seams to me that even though it is capable (with 1 1/2" bulkhead) of 1200GPH, that if the tank is only refilling at 800GPH, then that is all the faster it'll drain.
Is that an accurate analysis?