Yes, unless the joints on the down flow have some kind of restriction. Like when I put a 45 degree elbow to drain to the sump on the left side of the tank. The 1" pipe was good, but the ******** diameter of the joint was a little smaller, causing the water to back up. I put a similiar joint on the intake side and it equalized, then figured out I didn't need a sump and pt $250 of worthless parts into the tool shed. OOPS! The previous remarks are the opinion of a technical college graduate and should not be considered scientific or fact based!