Aquarium activated carbon safe?

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I'm cute and- know it.
Purred: Mon Mar 4, '13 7:18pm PST 
Just wondering if anyone has used that loose aquarium activated carbon for getting rid of pet odors. I want to have a few tablespoons in a jar near each litterbox to help with odors. It seems safe since people consume it but I read something about the dust of it being very harmful to lungs. One of my cats has mild asthma and I don't want to make things worse. If I rinse the carbon first that should take care of the dust, right/