You also need to take into account that if it has two 1" drains into the sump it will only allow 700 GPH flow rate (350 gallons per drain). If it has one 1 1/2 drain pluming then it can run up to 950 gallons per hour. I would add an AC 110 or FX5 if it were me. People seem to forget the importance of your intake when calculating GPH of filteration. I received these figures from a non partisan test. You will see different figures posted all over the web. You can get more pressure on the intake in the overflow if you use larger plumbing on the top (in the overflow box). Thats why most manufacturers of overflow kits use a large pipe that is tapered down to fit into the bulkhead. GL