Specifications include, but are not limited to: Furnish all materials, labor and equipment to sand blast exterior of each filter, remove and dispose of the existing filter media and clean the interior of the four (4) Horizontal Pressure Filter tanks and install the new filter media. Each tank is 8 feet in diameter and 20 feet in length. The filter media consists of new layers of gravel, one (1) layer of sand and one (1) layer of anthracite. The works shall also include the installation of two (2) 24-inch Slip On Flange Manway Hatches and cover, handhole patch repair, and the removal and replacement of all stainless steel bolts, nuts, washers and gaskets on existing manway hatches, new exterior paint for each tank including all labor, material and equipment necessary.