AO Smith Advanced Main Faucet Under Sink Replacement Filter for AO-MF-ADV System - Claryum Filtration Reduces Up To 99% of 78 Harmful Contaminants - AO-MF-ADV-R

The AO Smith Advanced Main Faucet Under Sink Replacement Filter is a product that is NSF certified, and it reduces up to 99% of 77 harmful contaminants. The filter system is only tested and certified for PFOS and PFOA reduction, according to the company. The filter needs to be replaced every six months, and there is no indicator or mechanism that alerts the user when the filter needs to be replaced. The filter is not recyclable, which was disappointing for one user. The AO Smith filter is slim enough not to get in the way of the plumbing under the sink. One happy customer said it worked great and was a good price, but another customer said it was expensive and infuriating when the water flow slowed to a dribble after eight weeks. Another user said the connections leak and that this filter might cause flooded basements.