Filtration: The water fountain filter consists of a three-layer filter system-cotton layer, activated carbon and ion resin. Cotton non-woven fabric filters large particle, Ion resin and coconut shell activated carbon remove heavy metal and soften water Used widely: Cat water filter replacement compatible with nugget 84oz/2.5L cat water fountain/pet water fountains shown in the pictures Tips: Please soak filters in water for 5 minutes and rinse the lite pet water fountain filters thoroughly under running water before use.Please decide whether to replace the filter replacement according to the specific situation of the pet drinking water Separate packaging: The pet water fountain filters for cat water fountain are separately packaged and sealed to your satisfaction What You Get: 8 pack cat fountain filter replacement compatible with nugget water fountain, worry-free 12 month, friendly customer service Age Range Description: Kitten, puppy, cat feeding & watering supplies Brand names and/or trademarks are used here only for product description or identification of devices and/or device types Our cat fountain filters provide clean, fresh water to your pet, which helps to increase water consumption and reduce the risk of urinary tract infections.