A filtration is a technique in which suction is applied to mixture of solid or liquid, either; it is filtered, to separate the liquid through the filter. Moreover; this technique of filtration is much faster than a gravity filtration, itself. Filtration usually includes the use of a filter flask, a filter trap, a water pump, and either a Buchner funnel or sintered glass crucible inside the lab. Liquid mixture is being poured into the filter from which liquid is sucked out into the filter flask by the action of the water pump, and any excess liquid that overflows out of the filter flask is caught in the filter trap. And, solid matter is left on the surface of the filter. The filter device has a disposable filter funnel and a disposable filtrate receptacle. The funnel and receptacle are used with a reusable base that is connected to a vacuum source. When the receptacle and funnel are mounted on the base the vacuum is applied through a connecting passage to the receptacle to draw the filtrate from the funnel into the receptacle.
This technique makes use of the fact that the laboratories are equipped with aspirators, a device associated with a water tap that permits access to a vacuum while water is flowing through it. This is a practical application of Bernoulli's principle, which describes the reduced pressure caused by a flowing fluid when it passes through a constriction .
