Aqualutio's new elkay EZH2O replacement water filter gives healthier and great-tasting water every time. The Replacement Filter Elkay 51300C has activated carbon filters to provide the safest water. This filter for water filling stations is NSF Certified to NSF/ANSI 42 and 53, 2020 for removing chlorine taste, and odor from water. The 51300C Replacement Filter needs to be changed every 3,000 gallons, or one year after installation. Individual replacement filter cartridge and multipack replacement filters are available for bottle filling stations. You can get a pack of 1, 2, 3, or 6 filters. This WaterSentry Plus Replacement Filter needs no tools for installation. Its quick-disconnect design allows easy replacement with just 1/4 turn of the filter. This Elkay 51300-C filter works with Elkay ezH2O bottle filling stations. It reduces lead, chlorine, and other contaminants from water and also reduces odors. Use a cold water line only. Do not allow installed filters to freeze. Do not attach a hot water line to filter and do not use this filter longer than its intended 12 Month use. Doing so may result in leaks and water damage. Elkay and WaterSentry Plus, and Halsey Taylor are registered trademarks of their respective holders. Aqualutio Company is not affiliated with Elkay and WaterSentry Plus, and Halsey Taylor. Their names are used for reference purposes only. How to Install (Step-by-step Instructions): 1. Turn off Water Supply 2. Remove the existing filter. 3. Install new filter in head and turn till locked. 4. Turn on Water Supply. 5. Check for leaks. 6. Flush system for 3-5 Minutes.