How to plumb uv to my system

[dbq5anlxj]

Hey
I want to plumb a uv to my tank but don't quite know what to do. It's a lifeguard 55w uv. I will remove the ato container and put the uv there horizontally. Any suggestions on how to make it work?

Or pull from second chamber the dump in the return chamber?

Any other suggestions? Thanks in advance

 

[shakacuz]

second option seems like it is easier/quicker.

 

[theMeat]

If you pull from last/return section the water will be clearest, and since uv works with uv penetration clearer water is more effective uv sterilization.
If you want to increase flow through fuge section have it dump back into first section