<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Hi All, I am starting a project tomorrow, I am building an underground emergency shelter that is fully self contained. I am installing a CO2 scrubber. I want a charcoal filter as well, and I would like the CO2 scrubber to do both jobs. Is there any reason I can not mix activated charcoal with absorbent. Is it better to have separate layers of media?</div><div dir="ltr" data-setdir="false">Hank</div></div></body></html>