--Compatible Cat Fountain: Designed for Oneisall 2L/70 fl oz super quiet cat fountain with water level window (PWF-001). Includes 12 replacement filters, 12 pre-filter sponges, and 12 pump sponges, providing long-term use for multiple pets.\n--Healthy Drinking for Pets: Multi-layered filter with cotton, activated carbon, and ion exchange resin removes hair, heavy metals, and odors. Ensures clean, fresh, and tasty water to increase hydration and reduce urinary tract risks.\n--Comprehensive 4-Layer Filtration: Pre-filter sponge and high-density fleece capture large particles; coconut shell activated carbon absorbs impurities; ion exchange resin softens water and removes heavy metals for optimal water quality.\n--Regular Replacement Recommended: Replace filters every 2-3 weeks for optimal performance. For multi-pet households, clean and replace sponges more frequently to maintain fresh and healthy water.\n--Easy to Use & Safe: Soak filters in water for 4 minutes before use to removen