10 pack carbon filters, 10 pre-filter sponges and 10 8D filter sponges set, perfect for 2L/67oz round stainless steel pet drinking fountains. The pet fountain filter is equipped with a 3-layer filtration system. High-density cotton layer, coconut shell activated carbon and ion exchange resin, they can filter hair, debris and heavy metals, improve the taste of water. High-density pre-filter sponge can further filter impurities and make full use of the filtration effect; high-density 8D filter sponge can filter impurities and prevent them from entering the pump, which can help extend the life of the pump. We recommend replacing the filter and sponge every 3-4 weeks, please replace more frequently. Before replacing the filter, rinse the filter thoroughly with drinking water for 3-5 minutes to prevent carbon powder from falling into the water and keep the water clean. Colour:As Shown Material:Non-woven fabrics Package Contents: 10 * Filter 10 * Sponge 10 * 8D Sponge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.