If their not pulling at a full silent siphon, maybe adding more pipe, on the drain side. To increase suction gravity force.
I would say sobuilding on that idea. the pvc is 1.5 inch if I add a 1.5 to 2 inch adapter will this increase flow having a wider opening funneling in?
A little, but the more suction head you can pull the better,as it, will drastically improve flow.building on that idea. the pvc is 1.5 inch if I add a 1.5 to 2 inch adapter will this increase flow having a wider opening funneling in?