1. USER FRIENDLY MAINTENANCE TIPS For use, place the filter in clean water for 5 minutes before installation, then rinse thoroughly to prevent coal dust from entering the water. So you can ensure your pets a clean drinking experience. 2. COMPATIBILITY These replacement filters are specially designed for 7L/230oz/1.8g stainless steel dog drinking fountains, ensuring your pet's water stays clean, fresh and tasty. for giving your pets a healthy hydration. 3. ADVANCED TRIPLE FILTER SYSTEM Features a triple layer filtration system with density cotton to filter particles and dirt as well as activated carbon that absorbs odors and impurities, ensuring that the water is always fresh and pure. 4. Improved pump protection: includes a round prefilter sponge that catches hair and large impurities, increasing the performance of the carbon filter, and a density rectangular sponge that prevents dirt from entering the pump, thus extending its life.