Liquid filters are mechanisms that are used to remove impurities that occur in liquids both from natural and unnatural sources. In order to achieve the filtration process, a liquid is passed through a permeable or porous substance that lets the liquid pass through while catching the larger solid particles that need to be removed. For the liquid to flow there must be a pressure difference that causes it to move through the filter. Usually, liquid filters are used to clean or purify a product or extend the life of piping by removing corrosive materials that induce erosion. Liquid filters have also been used to remove bacteria from certain liquids to prevent spoiling and, in other cases, to remove harmful particles so that the liquid may be recycled and reused.
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