This Filter (TH-02) is Tested and Certified by NSF international against NSF/ANSI Standard 42 for materials and structural integrity requirements. Twist and lock designed. Simple design provides easy, tool-free, no-mess filter replacement. Fits perfectly as same as the original. Premium Materials - BPA-free and food-grade materials. 100% Sri Lankan selected coconut shell carbon block, with 2x larger surface area and more micropores. Certified to reduce 99% of lead & chlorine taste and odor with 10+ impurities, offering superior contaminant reduction for you and your family. Monthly install stickers provided! Recommended Change Frequency: 3 - 6 Months / 200 Gallons. FilterReplacement