WaterSentinel WSM-2 Refrigerator Replacement Filter: Fits Whirlpool Filter 4 Made from Coconut Shell Carbon Made in US Note: This is a single item and not a pack of 4 WQA Gold Seal Certified to NSF 42 Economical alternative to expensive substitutes Reduces sand, silt, sediment, rust, chlorine taste and odor that may be present in your drinking water Designed to provide up to six months of life or 300 gallons Proudly Manufactured in America with US based customer service