Originally Posted by In.a.Box
keep in mind, 2 inlet mean more water will flow into the canister. The pump must pump up fast enough to keep up with the water flowing down.
Downgrade the inlet size. if its 1" use 2x 1/2"
While this is true, you have to make sure that you take the cross section of the tubing into consideration; it is not as simple as dividing the tubing diameter by two.