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Hydraulic fluids must be kept clean and free from contaminants in order to maximize their life and ensure trouble-free operation of the system. Dirt and water contamination in hydraulic fluids can result in faulty operation of control valves due to sticking spools and plugged orifices. Dirt also increases wear in system components. Therefore, strainers and filters are typically used to remove solid particles and vacuum dehydrators and centrifuges are often used to remove water. Wire mesh strainers are typically installed in pump sanction lines to remove larger particles. And filters that contain media that remove smaller particles can be installed in return lines to the tank, circulation systems, or in pressurized supply lines.