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.

• 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。