YUNDA FILTER CO. is a professional manufacturer about water filter elements.The sintered carbon block cartridge (CTO) uses NSF certified high density activated carbon and exclusive harmless adhesive as main materials. The sintered type CTO has better micron rate and filtration effects than domestic extruded type. The large granular surface area has a tremendous capacity to absorb chlorine, unpleasant odor, color, and spore and remove lead and microorganisms.