herbie Q

[authentic]

I run a herbie overflow.i have a ball valve to control the amount of water to the sump.the difference in height of my drain to my emergency is about 3" the suction on my drain causes a vortex on occasiondrawing air and getting the slurping sound.would cutting the drain a few more inches(keeping it further under the waterline)be the right move?

 

[Mike in CT]

Is it slurping on the main drain? 3 inches should be enough to dial it in once you start your return pump and it stabilizes after a few mins. I have my overflow on the back, so maybe I'm missing something.

 

[authentic]

main drain slurping dialed in pretty good

 

[Mike in CT]

What happens if you close the valve to bring the water up so the main drain is further under the water?