Sump question?

[Twisted_blenny]

So I just finished building my 20g sump and I'm confused is the bubble trap suppose to be before the refugium or after it?

 

[stiracerdude]

I might be wrong but I'm sure its after

this is a good article about sumps

Melevsreef.com | Acrylic Sumps & Refugiums

 

[Bifferwine]

After the fuge -- and before the return pump.