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Back pressure

A pressure downstream (outlet side) of the filter that creates resistance to flow of liquid or gas. This can result from closing a valve or entrapped air in a liquid system. This can also result from gradual blocking of the filter during use or to the resistance to flow caused by the filter itself. The amount of force required to move a sample through a filter increases as back pressure increases.

FAQ
A pressure downstream (outlet side) of the filter that creates resistance to flow of liquid or gas. This can result from closing a valve or entrapped air in a liquid system. This can also result from gradual blocking of the filter during use or to the resistance to flow caused by the filter itself.
The pressure among two points of a network carrying fluids can be known as a pressure drop. When frictional forces cause pressure drop through a resistance to flow, the pump must apply more power to overcome the additional pressure.
The difference between points of a fluid carrying network.