- Filtration system and benefits: The filter uses a three-layer setup with cotton, activated carbon, and ion exchange resin. This combination helps filter hair, particles, and heavy metals, and it improves water taste so pets can drink clean and fresh water from the cat fountain. - Compatibility and fit: Designed for 84 oz / 2.5 L Square cat fountains and other square pet fountains shown in the pictures. Verified compatibility ensures reliable performance with the pictured models. - How to use: Soak the filter in water for 2 minutes, then rinse thoroughly under running water before first use. Replace the filter every 2–4 weeks to maintain effectiveness and water quality. - Packaging and quality: Each cat fountain filter replacement is individually packaged and sealed to maintain high quality and ensure hygiene until use. - Practical use scenarios: - In homes with multiple or long-haired cats, regular replacement keeps fountain water clean and reduces the presence of hair and particles in the drinking water. - For pets that are sensitive to water taste, the filtration improves taste, encouraging more consistent hydration. - In shared environments such as offices, pet care facilities, or households with several pets, keeping up with filter replacements helps maintain fresh, appealing water for all animals.