I generally find 5-6" to be ideal. I use a 6" PVC coupler as a platform to raise mine to the needed height as my sump has a 10" water level, the coupler is a bit under 5" tall.
I generally find 5-6" to be ideal. I use a 6" PVC coupler as a platform to raise mine to the needed height as my sump has a 10" water level, the coupler is a bit under 5" tall.