Vacuum Filters are used for relatively coarse solids. They usually give continuous discharge so are used for handling large flow.
They are usually open so they are generally not used for hazardous materials or at temperature well over ambient. However, they can be enclosed if necessary and any hazardous liquid will not leak out as is possible with pressure filter.
They do not have to withstand high pressures so they can be made from a wide range of material of construction.
Type of Vacuum Filter: