This Waterdrop WD-F08 refrigerator water filter replacement for Filter 3, despite its affordable price, offers the best - a mix of prior filtration performance and important certifications from the well-known regulatory body in the industry - NSF 42 and NSF 372 certificates.Here, you are getting a significant improvement to the less-efficient charcoal filter that relies on coal, wood, walnut shell, and apricot shell to filter water. The filter material in this filter is a 100% Sri Lankan selected coconut shell carbon block, with 2x larger surface area and more micropores. Unlike the cheap and mixed carbon block, the filter material in the Waterdrop refrigerator filter improves the overall taste of your water.WD-F08 Refrigerator Water Filter Replacement for 4396841, Filter 3, EDR3RXD1, EDR3RXD1B, 4396710, 9083, 9030, 46-9020, 46-9020P, P1WB2, P1WB2L, W10121145, W10121146, W10177635, W10186667, W10193691, W10193691T.