Specifications include, but are not limited to: The City of Santa Fe is seeking bids for the provision of Granulated Activated Carbon Changeout. Replace Calgon Filtrasorb 820 media in two GAC contactors. The media must be Calgon Filtrasorb 820 in order to accomplish the water quality that is required. The filter media will be removed from the GAC filters and will be dumped onsite at a location designated by the Department. After removal, underdrains will be inspected to ensure proper flow. Once inspection is completed, new Calgon Filtrasorb 820 media is to be installed, with proper backwashing, in the two GAC contactors. Each contactor holds 70,000 lbs. of media which totals to 140,000 lbs. that will be replaced.