Elkay water filters provide cleaner, healthier drinking water, and are made of activated carbon. The Elkay water fountain filter, EZH2O filter such as the 51300C and 51299C also reduce contaminants such as lead. Water Sentry Plus filters are self-contained replaceable cartridges. You can also buy an Elkay filter kit, like the EWF172, EWF3000, or LF2, converting an existing water fountain or bottle filler into a filtered unit. Buy replacement Elkay filters here at quantity discount prices.