The hard to find 3M 4US-Max-S-f01h System Under Sink Replacement Water Filter is a white, one-stage water filter designed specifically for the 4US -maxS-f01h system Series model. This filter effectively removes impurities and contaminants from your water, ensuring clean and safe drinking water. With one filter included in the pack, this product is easy to install and maintain, providing you with fresh and refreshing water every time. Made by a trusted brand like 3M, you can rely on the quality and efficiency of this water filtration system for your home.