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Pressure drop refers to the difference between the feed pressure, and the accepts pressure. And it directly relates to how fast the slurry rotates inside the cleaner. The higher the pressure drop, the faster the slurry rotates, and the more centrifugal force is applied to the heavy contaminants. If the pressure drop is too low, the slurry will rotate too slowly, and contaminant removal will suffer. If the pressure drop is too high, the slurry will pass too quickly through the cleaner, and cleaning efficiency will suffer. A high flow rate also increases wear in a cleaner. This is why it is important to maintain the pressure drop through a cleaner at or near its design level.