Step 1: Commercial Filters
Step 2: A Filter's a Filter...
Now, these commercial filters come with carbon or other media as a chemical filter, so I just bought my own.
Step 3: Create a pocket...
Be sure to squish the glue between the filter parts.
Step 4: Fill with chemical filter media
I recommend putting a staple in the center of your new filter to keep it from puffing up like that.
Add chemical filter media.