EcoPure Dual Stage Under Sink Replacement Water Filter Set (ECODWF) | NSF Certified | Fits ECOP20 System | 6-Month Filter Life COMPATIBLE: Designed for use in the EcoPure ECOP20 Dual Stage Undersink Water Filtration System 6-MONTH FILTER LIFE: For best filtration results, filters should be replaced every six months, as recommended ADVANCED PROTECTION: NSF certified to reduce over 58 contaminants commonly found in drinking water, including sediment, chlorine taste & odor, cysts, lead, and chemicals INNOVATIVE: Convenient encapsulated filter design means water filter changes are quick and mess-free. No tools required. No need to shut off water supply. No touching dirty filters. HELPFUL: Faucet light tells you when its time to replace your filters. Still want filter-change reminders? Text EcoPure to 444999 to sign up. Questions? Our lifetime technical support staff is availablecall the EcoPure helpline at (800) 693-1138 or visit ecopure.com.Twist and lock design