CO2 Diffuser?

[Loddy Dod]

Hello! I am going to be setting up a planted tank soon and I was wondering what the best diffuser for a DIY CO2 Generator would be. I have seen several different types of diffusers, and I even saw someone say that you can put were the CO2 goes into the filter to be diffused.
Thanks in advance

 

[aqua_chem]

What kind of filter do you have?

 

[Loddy Dod]

One that hangs on the side