Bag strainer comprises three main components: strainer containers, supporting the basket and strainer bag.

Using bag strainers liquid, liquid from the  strainer container below the inlet side or enter from the top of the bag to be supported into the basket bag , the bag due to the impact of the liquid surface and uniform pressure to start making the liquid surface of the material in the filter bag to obtain a uniform distribution of liquid through the bag wall along the metal support basket , the bottom of the filter excluding the fluid outlet . Filter out particulate impurities are trapped in the filter bag , the filtering is done .