Compatible with PETLIBRO Dockstream Cat Water Fountain models PLWF005, PLWF115, and PLWF105. Includes 8 replacement filters and 8 sponges. Designed for up to 4 months of use. Provides fresh, clean water by effectively removing pet hair, dirt, and other impurities throughout the day. For best performance, soak the filter in water for 5 minutes before initial use. To ensure optimal filtration and support pet health, replace the filter every 2 weeks. Use only official replacement filters. Features a vertical multi-layer filtration system that purifies water and enhances oxygen content for better taste. Activated carbon helps eliminate unpleasant odors. Ion exchange resin reduces heavy metal ions and softens water. Non-woven fabric layer captures hair and debris. Built-in pump sponge helps prevent clogging and protects the pump from damage.