CUNO 3M 3 Stage Whole House Filter System W/ REPLACEMENT WATER FILTER CARTRIDGES CFS8720-S. Looks to be in great shape, the o-rings on filters need to be replaced. The item “CUNO 3M Whole House 3 Stage Filter System With WATER FILTER CARTRIDGES CFS8720-S” is in sale since Wednesday, February 3, 2021. This item is in the category “Business & Industrial\Restaurant & Food Service\Bar & Beverage Equipment\Commercial Water Filtration\Water Filter Systems”. The seller is “rewindrelics” and is located in Fort Lauderdale, Florida. This item can be shipped to United States.