Product Features: 1.Compatible with 1.6 L flower fountains. For example: PEDY, ISYOUNG, YOUTHINK and Hommii Flower Fountains. Note: Not fit for Catit Fountain. 2.Dual-Action Filters: Extra 2 packs of lon Exchange Resin are added in each replacement filter. With dual-action water softening filter for lon Exchange Resin + Active Carbon, it can filter dirt effectively. 3.The filter lasts longer and requires less frequent changes than normal active carbon filters. We recommend you replacing the filter every four weeks to keep water clean. 4.filter can help remove impurities and makes only fresh water available to the cat. Product Specifications: Item Weight: 141 g Package Dimensions: 13.2 x 13 x 8 cm Package included: 4/8 x Cat flower fountain replacement filters