The vacuum filter is mainly used for liquid-solid filtration under vacuum conditions. It has been widely used in laboratories nowadays.

Though filtration can be done simply with gravity, more often vacuum filtration is employed because it is much faster. Several points are worth remembering. First, be sure to clamp your filter flask securely. These flasks are easily upended. Use the trap between your filter flask and the aspirator. Also, be sure to use thick-walled vacuum tubing and not the thin-walled tubing used for water lines.