A genuine OE part from Doulton, the W9223021 ultracarb ceramic water filter takes your water through three filtration stages to ensure you get the cleanest taste possible! Each filtration stage will reduce more and more contaminants from your water, including fine particulates, turbidity, bacteria, chlorine and lead. The result will be the highest quality, best tasting drinking water imaginable! NSF Certified. Order the W9223021 Doulton ceramic water filter today.