[Compatibility] ONLY Compatible with 67oz/2L Pet Water Fountain. If any doubt, please check product dimensions. [Compatible Pet Filter] Length is about 4.62 inch. Shortest Width is about 1.75 inch. Width is about 3 inch. Thickness is about 0.62 inch. [Premium Quality Filters] Double Filtration System: Composed of a cotton layer 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 15-20 minutes then rinse thoroughly under running water before using. 1 to 2 weeks in summer and 2 to 4 weeks in winter. If multiple cats are using the fountain, more frequent replacement be necessary. [Premium 12 Pack Pet Fountain Filters] 12-pack of premium pet fountain replacement filters and 24 Pack of pre-filter sponges individually packaged and sealed to maintain high quality. Enough supply for 3 to 12 months of use. Replace the pre-filter sponge every 4-6 weeks. [Compatibility] ONLY Compatible with 67oz/2L Pet Water Fountain. If any doubt, please check product dimensions. [Compatible Pet Filter] Length is about 4.62 inch. Shortest Width is about 1.75 inch. Width is about 3 inch. Thickness is about 0.62 inch. [Premium Quality Filters] Double Filtration System: Composed of a cotton layer 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 15-20 minutes then rinse thoroughly under running water before using. 1 to 2 weeks in summer and 2 to 4 weeks in winter. If multiple cats are using the fountain, more frequent replacement be necessary. [Premium 12 Pack Pet Fountain Filters] 12-pack of premium pet fountain replacement filters and 24 Pack of pre-filter sponges individually packaged and sealed to maintain high quality. Enough supply for 3 to 12 months of use. Replace the pre-filter sponge every 4-6 weeks. Color: White Material: Plastic + Filter Cotton Package Contents: 12-pack of premium pet fountain replacement filters 24 Pack of pre-filter sponges Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.