I don't use carbon pads in my filter as a rule. They're good at removing medication and funky smells, but then they should be promptly removed or replaced.
Quote:
Originally Posted by Meredith
you can also use 100% polyester pillow batting
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If you use polyfill fiber, make sure it has not been treated with Microban, or some other anti-bacterial/anti-fungal agent!

Another option is to buy a sheet of air filter material at a home improvement store and cut a pad to size. Again, be sure to avoid any product that has been chemically treated.