In many laboratories, liquids are filtered:
In laboratories that handle drinking water, water desalination, and waste water, it is customary to filter aqueous solutions to identify suspended solids and various microorganisms.The filtration is performed by extremely dense filter paper with holes of 1 micrometer in diameter and less. For this purpose, a vacuum pump and filter cups are used into which the tested liquid is poured.
The cups differ from each other in the material they are made of: filter holder made of disposable plastic, filter holder made of glass or stainless steel that can be sterilized and used in water laboratories, chemical laboratories
For separations of chemical and industrial solvents.