Package Contents: You will receive 12 sponge filters for cat fountains with a triple filter system. Enough to meet your use and replacement needs, providing clean drinking water for your pets. Product Dimensions: The dimensions of the cat water filter sponge are 11.4 × 5.7 × 1.9 cm, compatible with WF-050 and WF-100 1.5L pet fountains. Please confirm the dimensions before placing an order. Purchase. High-quality Material: The pet fountain sponge filter is made of high-density sponge, activated carbon, and ion exchange resin. The material is soft and reliable, providing a better water purification effect for your pet. Filtration function: With high-density, high-content activated carbon, these pet fountain filters can effectively filter hair, dust, heavy metals, and other impurities. Keep your pet's water clean and fresh. Helpful tips: Rinse the cat fountain filter sponge under running water before use, soak the foam filter for 5 minutes, and replace the sponge filter every two weeks