Package contents: 12 parts of drinking fountain filters with a triple filtration system. This quantity meets use and replacement needs and provides your pets with clean drinking water. Product size: The sponge measures 11.4 × 5.7 × 1.9 cm and is compatible with 1.5L WF-050 and WF-100 Clear Pet Fountain. Please confirm the size before purchasing. Premium material: The PET Fountain sponge filters are made of high density sponge, activated carbon and ion exchange resin. Soft and reliable material that supports better water purification. Filtration function: With high density and activated carbon, these filters effectively filter hair, dust, heavy metals and other impurities. Keep your pet's water clean and fresh. Use scenarios: Suitable for homes with multiple pets using a 1.5L fountain. Ideal in dusty or shedding environments to reduce debris in water. Useful as part of a regular maintenance routine to replace filters and maintain water quality.