About The Item: Highly Efficient Filtration:the Food-grade Coconut Sell Carbon Block Filter With 0.5 Micron Small Pore Size Highly Remove Calcium, Chlorine, Bad Odors And Harmful Contaminants,improving The Water Quality And Prolonging The Lifespan Of Your Coffee Machine. Safety Micromesh Material: These Coffee Filters Replacement Are Certified Nsf42 For The Reduction Of Chlorine,taste And Odor By Nsf International. It Can Be Found On The Water Quality Association & Nsf Websites. Our Filters Fil.