The ZeroWater water bottle kit is the only filtered water that meets the FDA definition for purified bottled water. Includes a large capacity refillable water bottle, two pack ZeroWater patented Ion Exchange filters and digital TDS meter to measure water quality. For use with most standard water dispensers. For best results use with dispensers made with stainless steel reservoirs. Equipped with a patented 5-Stage Dual-In Exchange Filtration System. Water Filters Type: Dispenser Filter; For Use With: Water Dispensers; Filtration Type: 5-Stage Dual-In Exchange Filtration.