Size: outer diameter: 12.7 cm, inner diameter: 3.8 cm, thickness: 1 cm - The filter size is 12.7 cm in diameter and will fit most pet flower fountains.

[premier pet fountain filters]pet fountain filter replacement Better Filtered Water - Each cat fountain filter has an upgraded version of 8 small cotton filters, It can filter impurity water flow more evenly to obtain a higher quality water source，Compatible with Most Pet Water Fountain。 

[High Quality Activated Carbon and Resin ] This cat water filter is made of high-quality coconut shell and cotton, filled with activated charcoal and ion exchange resin. It also filters hair and residue, removes odors, and has a cleaning and revitalizing function that makes the water taste better, giving your pet access to clean, freshwater every day. 

[Cat Fountain Filter Instructions for Use] To prevent the activated carbon dust from shedding into the water, please rinse the replacement filters with water thoroughly before use to remove any excess or loose charcoal dust， Then install the cat fountain filter replacement into the cat water fountain。 

[Filter Frequency of Replacement ] cat water dispenser filters are individual so that each one will be fresh，Change a cat fountain filter after using 2 to 4 weeks to keep water running fresh and clean， ​If multiple pets use the water dispenser, more frequent changes will be required. Buying a replacement cat water dispenser filter at a cost-effective price is a smart choice。