1. I am getting ready to get the sump pump and begin this build but had some questions, first are 3/4 bulkheads ok? It has a overflow box with 2 3/4 bulkheads. Also how much flow do I need? And how strong should my return pump be? I have a 29 gallon sump. I will also have 2 500 gph power heads. Any information would be helpful because I am new to the sump set up and just need information on what to buy. Thanks