1 gallon filter?

It doesn't come with carbon, just the two sponges. however if you want to add carbon you can make a small bag out of pantyhose and put some in and fit it in the filter. You may have to take one of the sponges out, but it should work. Good Luck!
 
...just wondering if I "should" or not. Hmm...

now to think about restocking it...
 
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