Membrane Solutions 20"x4.5" KDF Big Blue Whole House Water Filter Reduce Heavy Metals Iron LeadSuperb Filtration Performance: The KDF can remove up to 98% of iron, lead, mercury and other heavy metals, protecting your household appliances from scale inhibition. The granular activited carbon can remove up to 99% of chlorine, odor, tastes and other contaminants or impurities in water, providing you great tasting drinking water. Reliable Water Filtration: This composite filter will help your business prevent costly build up of rust and other