This may work. You should have pump, solar, swg. You need a ball valve to get more flow. From pump out add a t, obviously one end from pump, one end of t to solar, the other to a ball valve, from the ball valve, another t, one end from solar, the other to swg. You can now open the ball valve and bypass the solar a little to increase your flow.


pump
+--------to solar
ball valve
+---------from solar
swg

Dont know why im having trouble putting this into words, but it should work. When I use my solar, there is not enough flow for my auto vac, so i open the ball valve and the flow increases since im not diverting all the water through the solar panel.