Thank you for viewing. This is an unused item. Purchased in March 2024. I am selling it because I no longer use the main unit. ------------------ 【Product Description】 Homerunpet Automatic Water Dispenser Exclusive: This filter unit is exclusively for Homerunpet smart pet automatic water dispensers, model numbers WF20 & CF20. It cannot be used with other brands' products. Product Contents: The filter unit comes with 3 pieces. Clean, flowing water is loved by both cats and dogs, so please use it daily. Three-Layer Structure: It has a three-layer structure with a layer of coconut shell activated carbon sandwiched between high-density micro cotton. It filters out not only pet hair and dust that are difficult to see, but also heavy metals and chlorine. This allows cats and dogs to drink clean water, reducing the risk of urinary tract infections. How to Use: After removing the filter unit from its packaging, first soak it in water for 2 minutes and wash it. It is recommended to replace it once a month. The frequency of replacement may vary depending on the number of pets and the frequency of drinking water, so please adjust it according to the actual situation. ------------- Thank you for your consideration.