The Neo-Pure NP-EWS is used as a replacement filter for the Elkay 51299C, 51300C and WSF6000R and Halsey Taylor 55898C. Great-Tasting Water. Easy Installation. This filter features an easy and quick installation process. Pre-filter mesh, made of spun polypropylene. With it's quick change cartridge connections, you will have clean water in minutes. IAPMO Tested. Tested and Certified by IAPMO to the following NSF Standards: ANSI/NSF Standard 42-Chlorine Class 1, and Taste and Odor. ANSI/NSF Standard 53 for Reductions of Lead and Cyst. Certified Performance: Independently tested and certified by IAPMO to meet NSF Standards 42 and 53, ensuring effective reduction of chlorine, lead, cysts, and other contaminants, providing peace of mind with every glass of water. The Neo-Pure NP-EWS Elkay Compatible Filter is a cost-effective alternative replacement for Elkay water coolers, drinking fountains, bottle fillers, classroom bubblers and cold water dispensers. It makes water safer, purer, and more delicious. The NP-EWS is a quick and easy installation for better tasting water. This filter has a 4,750 gallon capacity as well as a 1.5 gallon per minute flow rate.