OnePurify RFC2500A2PK MWF Smart Water Compatible Refrigerator Filter (2-Pack) Simple, 1-step installation. Get the same OEM performance without compromising quality or flow rate. Your family deserves healthy, crystal clear drinking water. NSF/ANSI certified to remove chlorine and other contaminants. CERTIFIED AND TESTED by the Water Quality Association to NSF/ANSI 42 standards. Manufactured in an ISO9001 / FDA Registered facility. For optimum performance change your filter every 6 months. Included with your purchase is a set of reminder stickers to remind you when it's time to change.