【Perfect Fit】4-pack pet water fountain filters is specifically designed for lesotc Dog Cat water fountain. Filter cartridge ONLY. 【7-Layer Efficient Filtration】High-density activated carbon and ion exchange resin filters enable multiple filtrations, effectively filtering out hair and heavy metals in the water, ensuring the safety and cleanliness of pet drinking water. 【Feel Happy】With this filter of dog water fountain, dogs can drink safer and cleaner water, which will contribute to their overall health and daily happiness. 【Easy Installation】The user-friendly design allows for easy and quick filter replacement, saving time and effort. 【Every Two Weeks】To ensure fresh water quality and the health of your furry friends, we recommend replacing the filter every two weeks.