My sump drain is making huge bubbles

[Dseg]

Read the title. My drain into my sump is making huge bubbles. I have a stand pipe thing for my drain in my overflow. I figured it was getting enough air in the top so I made the hole bigger but has huge air bubbles coming from my drain hose.

[danil]

there is a way to make your overflow almost silent.. just put the vent on it and adjust the flow... it works really well but to make system safe you also want to have 'emergency' second overflow with inlet set above the main one in case your vent get clogged or you accidentally close it.

[Dseg]

you make a hole in the top of the stand pipe? I already did that