1. Compatibility: These replacement filters are designed for 3.2L/108oz ship-shaped cat drinking fountains, including stainless steel models with a water level window, as well as 4L/134oz cat water fountains. Ensure your pet's hydration system remains effective and efficient. 2. Four-Layer Filtration System: Our advanced filters feature a non-woven fabric layer, activated carbon, ion exchange resins, and a durable pp plastic shell. This multi-layer design combines absorption, filtration, and interception to effectively capture cat hair and debris, eliminate odors, and soften water for your pet. 3. Maintenance Tips: For optimal performance, soak the filter in freshwater for 5 minutes prior to use and rinse thoroughly under running water. Replace the filter every 1-2 weeks during the summer and every 2-4 weeks in winter. Increase frequency with multiple pets to maintain clean drinking water. 4. Fresh, Clean Drinking Water: Each drop of water is meticulously filtered through multiple layers, ensuring oxygen-rich hydration that is fresh and appealing. This encourages pets to drink more, aiding in their health and reducing the likelihood of urinary tract infections. 5. Practical Applications: Ideal for homes with multiple pets, ensuring their water source is consistently clean; perfect for busy pet owners who want to maintain their pet's water quality with minimal effort; and beneficial for pets that need encouragement to stay well-hydrated throughout the day.