OK I know you all do not just buy new can filters when the carbon has expired. Where do you guys get the replacement carbon from.
50 lb bags top quality coco carbon ----http://www.carbonactivatedcorp.com/
That is where I buy my carbon .All my reading leads me to belive virgin coco carbon in the granulated form works best as well as lasting abit longer.On the down side the 4x8 mesh granulated I have been using is alittle more rtestrictive as far as air flow and Messy(dusty)A prefilter is nessesary or carbon dust will escape into fan and beyond .I might try 6x12 granulated next bag .Can filters came with pelletized carbon years ago not sure if they still do ,but I think I get better odor protection and longevity from the granulated type,I can deal with the dust cause the trade off is 100% odor removal