you can get replacement prefilters for a lot of carbon scrubbers on the market today... the just tossed in an extra one for me when i got mine cuz they made a small rip in the original one loading it in my truck... i just put a bunch of gorilla tape around the rip and i've been saving the new one for when the first one starts to look dirty... i think all can scrubbers come with prefilters though; i could be wrong
