Shale shaker screens are a part of drilling equipment used in many industries, such as coal cleaning, mining, oil and gas drilling. These screens are considered to be the first phase of a solids control system on a drilling rig. They are used to purify the liquid by removing large solids also called cuttings from the drilling fluid. This processes minimizes fluid loss and is helps lessen the environmental impact of the process. Shaker screens are the primary solids separation tool on a rig. After returning to the surface of the well the used drilling fluid flows directly to the shale shakers where it begins to be processed. Once processed by the shale shakers the drilling fluid is deposited into the mud tanks where other solid control equipment begin to remove the finer solids from it. The solids removed by the shale shaker are discharged out of the discharge port into a separate holding tank where they await further treatment or disposal.