You will receive 12 cat fountain filters. The sufficient quantity is enough to meet your usage and replacement needs and provide your pets with drinking water. The fountain filter is compatible with Catit PIXI 43717 cat fountain. Please check your fountain model before purchasing. The cat fountain filter is made of activated carbon, filter cotton and cation resin. They can filter hair and heavy metals and improve the taste of the water, allowing pets to drink clean, fresh water all day long. Fountain filters provide safe drinking water that is common and suitable for cats and dogs, help increase water consumption and reduce the risk of urinary tract infections, please rinse the filter sponge of the cat fountain water before use, and it is better to replace the sponge filter every 2-4 weeks and clean the fountain regularly. Note: The data is all manual measurement, please allow an error of 1-3cm due to the difference in light and display, there will be a certain color difference,