Accurately analyses hydraulic system contamination level, which can help designers to configure filter, optimize the system and design more stable hydraulic system.

With this method, we can determine the water quality and the contamination level in some region objectively and directly by evaluating the quality of the regional water environment.

Advantages sof direct sampling are that areas hardest to clean and which are reasonably accessible can be evaluated, leading to establishing a level of contamination or residue per given surface area.