About This [Compatibility] PETSTANDARD Replacement Filter Compatible with WOPET Water Fountain 67oz/2L & 118oz/3.5L ; W300, W300B, W500. These are PET STANDARD branded filters. [Premium 10 Pack Pet Fountain Filters] Pack of 10 Filters and 4 Replacement Pre-Filter Sponges [Compatible Pet Filter] Filter Measurments: 2.5" x 1.5" x 1.25" [Premium Quality Filters] Triple Filtration System: Composed of a cotton layer, carbon prefilter and activated carbon. Effectively to filter hair, heavy metals, keeps water fresh and improve the taste of the water. [Frequency Of Replacement] To prevent the activated carbon dust from shedding into water, please soak the cat fountain filter in water for 2 minutes then rinse thoroughly under running water before using. Change every 2 to keep water running fresh and pure. Overview Product Dimensions : 1.5"D x 1.5"W x 2.5"H External Testing Certification : WQA Product Benefits : Removes Impurities Brand : PET STANDARD UPC : 850044679119