因为滤渣器与泵塞是连轴一起移动的，在下冲程期间进入的液体可以起到冲刷作用，利用液体的冲刷来清理滤渣器，使砂粒悬浮于产出液中。
Because the filters move with the plunger, the sweeping action of the fluid on the downstroke cleans the filters and keeps sand suspended within the production fluid.
过滤通常被用于分离小颗粒，从砂粒到离子都可以，由具体使用的方法而定。水力旋流器和离心机则利用离心力场将粒子抛出悬浮液。
Filtration can currently separate particles from sand to ions, depending on the process used. Hydrocyclones and centrifuges employ centrifugal fields to fling the particles right out of suspension.
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