A New Filter

My coworker mentioned today that they were having problems with their fish tank.
In that one of their fish had gotten ick.
And that they'd bought the medicine for that but hadn't realized that their filter contained carbon in it, so the medicine got filtered out before it could become effective.
So my coworker was planning to buy a new filter today that didn't contain carbon in it.

And my response was like "....Couldn't you just take the cartridge out of the filter? It still works without that in it." 

-Because the cartridge is what contains the carbon that filters the water. So you take that out and the filter still makes the water flow and such, it's just not filtering.

^^;; It was like a revelation to my coworker lol. 
They hadn't considered that.

Definitely a much easier method than buying a new filter. ^^;; 
Especially since like....a filters come with cartridges with carbon in it....

-Sarnic Dirchi