UPSKY Dog Water Bottle Leak-Proof Portable Dog Water Bottle Bowl Durable BPA Free Pet Dog Water Dispenser with Activated Carbon Filter Travel Dog & Cat Drinking Cup Water Bottle Bowl for Walking &hellip; [Fiber Activated Carbon] 100% extracted from coconut fiber. Coconut shell activated carbon has larger adsorption area than ordinary coal carbon, which enhances adsorption capacity and speed. [Adsorption of Impurity] Strong water filtration effects make it effectively absorb impurities in water. Make sure your pet drink clean and non-toxic water. [Removing Residual Chlorine] Meets the NSF/ANSI standard 42 requirements for chlorine removal. Removing residual chlorine and eliminate odor while using of high quality activated carbon filter core. [Improve Water Quality] The activated carbon filter can improve the taste of water. Let your pet like to drink water and become healthier. [Using Suggestion] Before using,please rinse the filter with water for 3-5 minutes. Changing once every 2-6 months or 100 bottles water for better Filtration effects.