Specifications:Name: Replacement FilterInner material: Activated carbon, resinColor: WhiteDiameter: 125 mmPackage content:24 pcs x replacement filtersCompatible with YOUTHINK, HOMMI, ISYOUNG, KOALAD, HAPPYPAPA, PEDY, automatic flower fountain and others of the same size.Double-acting filter: resin and activated carbon. Resin can soften water and reduce the risk of lithiasis. Activated carbon can adsorb impurities and odors, keeping the water fresh and clean.PP cotton can filterRemove hair, sediment and dirt to purify water.The water quality can be removed by the three 3 types of filtration.The outer cotton layer of each filter traps hair and dirt.Three stages of filtration can ensure water quality and improve water qualityFresh water taste for your cats.Rinse the filter thoroughly with water before use. Just install it on the pet water fountain. To ensure that the water is clean, the filter should be replaced in time. Please replace it within 2 to 4 weeks.Note: Please allow 1-3 cm (0.4-1.18 \") difference due to manual measurement and measurement small color variations for different display settings.Thank you for your understanding, have a nice day!