This is the WaterSentry Plus replacement cartridge Elkay built for its hydration stations, and it's a straightforward swap when your unit signals it's time. The filter uses a spun polypropylene media to knock down sediment and improve chlorine taste and odor, while also reducing lead in the water passing through - a solid baseline for a fountain or bottle-filling station that sees regular daily use.It's not built to handle everything: this cartridge doesn't target microorganisms, pharmaceuticals, cysts, or general chemicals, so it's best suited for facilities managers and building owners maintaining Elkay drinking water equipment who need dependable taste and sediment control rather than a full-spectrum filter. One cartridge per box, sized to drop into the hydration system it's designed for. Filtration method: spun polypropylene Reduces chlorine taste and odor Reduces lead Reduces sediment Dimensions: 3.95" x 3.85" x 13.25"; weight: 2 lbs Made in Mexico; 1 filter per package