Compatibility：These filters are designed to be compatible with veken 95oz/2.8L Automatic Pet Fountains. Before making a purchase, it is essential to verify the model of your pet fountain to ensure a proper fit. Triple Filtration System：Our filter features a triple filtration mechanism. It consists of a cotton layer, activated carbon, and an ion exchange resin. This combination is highly effective in filtering out pet hair, as well as heavy metals, providing clean and healthy water for your pet. Filter Dimensions：The filter has the following dimensions: it is approximately 3.9 inches in length, 3.9 inches in width, and 0.4 inches in thickness. Package Contents：The package contains a total of 40 cat water fountain replacement components. This includes a pack of 24 replacement filters for the cat fountain and a pack of 24 pre - filter sponges. Notice：Before use, it is recommended to soak the foam filter for 5 minutes. To maintain optimal water quality, the filter should be replaced every 2 - 4 weeks. Cat Fountain Replacement Filters with Pre-Filter Sponges, Compatiable with Veken 95oz/2.8L Automatic Pet Water Fountains