Originally Posted by Jbird745
I have ball valves on both for adjustment I believe my return is throttled down I'm not sure on the gph
of the pump
You dont need a ball valve on the gravity pipe to the sump,keep this fully open or remove it.Open the return pump valve until the gargling quietens a bit,then using some 1/4 " internal diameter hose or pipe,slide this down the pipe going down to the sump until the water level in that section of the overflow box starts to rise,keep lowering the hose/pipe until that water level is around 1/4" below the water level in the first section of the same box(the overflow box out side the tank)this should now be totally silent.
I did this last night and now my box is the quietest its ever been!!!