Waterdrop Refrigerator Water Filter, Compatible with Amana Clean N Clear WF401 Waterdrop is Committed to Improving Water Filtration Technology and Offering Clean Water. NSF CERTIFIED: Tested and certified by NSF International against NSF Standard 42 for chlorine, bad taste and odor reduction. QUALITY PERFORMANCE: Premium coconut carbon block filter is certified to improve taste and quality of water. Delicate design ensures it perfectly fits the original without water leakage. FILTER LIFE: Our high-quality refrigerator water filter provides up to 6 months or 350 gallons of clean and fresh water. REPLACEMENT MODEL: WF401, 12527304, WF40, 46-9904, WF292, WSA-1,Tier1 RWF1090, Amana WF401P. Waterdrop is an independent brand.