WATERMAN Portable Alkaline Water Purifier Replacement Filters (3 Count) + Water pH Testing Kit CREATING A HEALTHY LIFE: It's an antibacterial water filter that removes harmful chemicals and provides safer drinking water SAFETY CERTIFICATION: high quality coconut block is made of coconut, and the product material has passed the NSF42 test. Use our water filter to reduce the chlorine content of your utensils in water and ice. MATTERS NEED ATTENTION:Please first drain approximately 4 gallons to maximize the efficiency of the filter, Please renew your filter every 6 months The BEST CHOICE: our products are of good price and good quality, which are worth buying. SERVICE GUARANTEE: If you have any product problems, please contact Amazon Customer Service or us. We will try our best to solve all the problems for you.