CB Tech’s carbon block filters are considered the most effective method for reducing a broad spectrum of contaminants of health concern, such as Arsenic V, chemicals, pesticides, herbicides, DBPs, heavy metals, cysts, asbestos, particulates, chloramine and chlorine. CB Tech is the original manufacturer of carbon block filters; its proprietary technology offers superior effectiveness and its products have been tested and certified by NSF International for the reduction of the widest range of contaminants.