This listing includes two water filter replacement cartridges, model 51300C, designed specifically for the EWF3000 system by Elkay. These cartridges are ideal for use in commercial water filtration systems, particularly in the restaurant and food service industry. They are designed to fit seamlessly into your existing system, providing high-quality filtration to ensure clean and safe drinking water for your customers. With these replacement cartridges, you can trust that your water filtration system will continue to operate at peak performance, providing superior results every time.