Aquasure AF-D05CER Dash Series 0.5 Micron Micro-Ceramic Carbon Block Filter with Microban Anti-Microbial Technology NewThe Aquasure AF D05CER is a 0. 5 micron carbon block filter that provides excellent contaminant reduction which includes cyst, microbial, VOCs, PCBs, Pesticides, Herbicides, Chloroform, chlorination by products, and certain heavy metals such as lead. 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.