Replacement filters for cat water fountains provide high-quality 3-layer filtration to keep your pet's water clean and fresh. Each round filter features a combination of strong fiber cotton to trap debris, coconut shell activated carbon to remove odors and chlorine, and ion exchange resin to soften hard water. This comprehensive set includes 12 replacement filters and 4 pre-filter sponges, specifically designed to be compatible with most 81 oz (2.4 L) pet water fountains. The durable design ensures fast absorption and effective purification for a healthier drinking experience for your cats or small dogs.

Measurements:
• Filter Diameter: 5in
• Filter Center Hole: 1.4in
• Filter Thickness: 0.4in
• Sponge Length: 2.5in
• Sponge Height: 1.2in
• Sponge Width: 1.1in