In case the drillers are unsatisfied with the quality of the drilling fluid once it is fully cleansed by the desander, they use a disilter to further purify the liquid. However, the thickness of the fluid should be kept at a certain level to enhance efficiency in the drilling process. The purpose of keeping the drilling fluid at a certain and specific thickness is to ensure that it is able to move up and down the driller at an efficient pace. In addition, it should not be too thick, as it cannot flow through the driller. Hence, cleansing of the fluid is an essential process in the drilling process.