Amazon.com: PurAir Filters Charcoal Purifan Replacement Filter, PAF-DOC, Twice the charcoal for extra clean Air Black & White : Home & Kitchen
Here I have for you to show - a PAF particulate prefilter. This filter is used as a disposable prefilter for EO-16 and EO-65-K canister filters used in RsH-4 and ShMS kits. :