Smith Central water filter Whole House Water Filtration System 938433 NEW. The item “A. O. Smith Central water filter Whole House Water Filtration System 938433 NEW” is in sale since Tuesday, January 26, 2021. This item is in the category “Home & Garden\Home Improvement\Plumbing & Fixtures\Pumps & Water Filtration Systems\Water Filtration Systems”. The seller is “digital-r-us” and is located in Youngstown, Ohio. This item can be shipped to United States.