Got it full...went to test the sump with only one pump and the 3" drains don't flow enough. Idk who the hell wrote all the flow charts I read but everyone said about 8k gph via gravity. Well with those numbers 2 should flow about 16000...not. Now I have to redesign the sumps returns.....any ideas? I was thinking ordering another liner and making a waterfall type return but idk. I'm kinda pissed