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Gravity filtration is a method of filtering impurities from solutions by using gravity to pull liquid through a filter. The two main kinds of filtration used in laboratories are gravity and vacuum/suction.
Gravity filtration is the process of pouring the mixture from a higher location to a lower one. It is frequently accomplished via simple filtration, which involves placing filter paper in a glass funnel with the liquid passing through by gravity while the insoluble solid particles are caught by the filter paper.
Sand filters are used as a step in the water treatment process of water purification. There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world.
Chemical additives, such as coagulants, are often used in conjunction with the filtration system. [1]: 7–9 The two types of rapid sand filter are the gravity type (e.g. Paterson's filter) and pressure type (e.g. Candy's filter). A disinfection system (typically using chlorine or ozone) is commonly used following filtration.
Portable water purification devices and methods are available for disinfection and treatment in emergencies or in remote locations. Disinfection is the primary goal, since aesthetic considerations such as taste, odour, appearance, and trace chemical contamination do not affect the short-term safety of drinking water.
Besides Depth Filtration, a number of membrane filtration methods are also used for different industrial applications such as Reverse Osmosis, nano-filtration and Microfiltration. [9] These use the same principle, rejecting contaminants larger than the filter size. The main distinguishing feature amongst them is their effective pore size.
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