The BioGuard unlike any other water filtering cartridges on the market today treats your whole house water supply for Virus, Bacteria, Cyst, and Turbidity with No Elecrticity, no wasted water and no moving parts. Replacement filter utilizes a non-woven filter media containing a thermally bonded blend of micro-glass fibers and cellulose infused with nano-alumina fibers. The micro-glass and cellulose act as the scaffold upon which the active component of these filters (the nano-alumina fibers) is permanently affixed.