A filter is a membrane with pores, which won't allow the insoluble solid particles to pass through it?

A filter is a membrane with pores, which won't allow the insoluble solid particles to pass through it.

Filtration is a process that uses a filter to remove pollutants from water. The filter can be a physical barrier, such as a filter made of sand, or it can be a biological barrier, such as a filter made of bacteria.