Aquasure AF-D05MCB Dash Series 0.5 Micron Carbon Block Filter with Microban Anti-Microbial Technology NewThe Aquasure AF D05MCB is a 0. 5 micron carbon block filter that provides excellent contaminant reduction which includes VOCs, PCBs, Pesticides, Herbicides, Chloroform, and other chlorination by products. It also incorporates Microban technology that inhibits the growth of bacteria that can cause odors and fouling of the filter surface; keeping your filter working at peak performance.