WCC American Plumber Undersink Filter Replacement CartridgeAmerican Plumber is a trusted name in water filtration that offers you peace of mind with their high quality products. The American Plumber WCC filter provides the most contact time between the carbon filter media and your drinking water for more effective chlorine taste and odor reduction. Nominal 20 micron post filter reduces the carbon fines often found in filtered water for better tasting water.