durso overflow problem

[tatties]

so i redid my drain plumbing. re installed my durso in my overflow, and its a constant flushing, almost constant. its like an ocean down at the bottom where the water dumps.

ive played with the air intake, drilled holes. nothing.

i have my pvc all the way to the bottom of my sump (underwater), should this be shortened to drop the water in the sump (not underwater)?

its super frustrating, cant get it to shut up.

 

[TheEngineer]

I'm assuming it was quiet before, right?

 

[Sailingeric]

Get a gate value and go Herbie. My tank is super quiet once I went to a Herbie.