Add to Favorite Sellers. 3M Whole House Sanitary Quick Change Water Filter System – AP903. The item “3M Whole House Sanitary Quick Change Water Filter System AP903″ is in sale since Tuesday, October 3, 2017. This item is in the category “Home & Garden\Home Improvement\Plumbing & Fixtures\Water Filters & Filtration Parts”. The seller is “restauranttory” and is located in Pottstown, PA. This item can be shipped to United States.