This video explains the importance of choosing a NSF certified water filer. Choosing an NSF filter helps you ensure that it removes the contaminates that it claims to remove. There may be some harmful things in your water. NSF-certified filters help remove lead, asbestos, chlorine taste, odor, cloudiness, pesticides, and pharmaceuticals. Knock off water filters are cheaper, but they’re not NSF certified to remove anything. Counterfeit filters look like the real thing. So make sure that you purchase your filter from a reputable seller.