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nature : gravel filter media for the filtration equipment. Larger commonly known as sand filters. Filtering of only apply to a small number of large particles of liquid, such as water turbidity filter. A circular groove, a square pool or other vertical vessel. Bottom home at the end of a porous to facilitate cleaning. At the end of accumulation on the gravel of different sizes, generally placed below the most coarse particles placed above the smaller particles, the top placed sand. With mouth open and closed two, the former under-pressure natural filter, which used to pump pressurized water turbidity filter. Muddy water flows from the top, bottom water from the outflow. After some time filtering, sand mixed with Residue, filter pores are blocked, must be in addition to washing. That is to send water from the bottom and discharged from the top of Residue away by the plot. In large sand filter, the bottom of commonsense time trachea, in the cleaning before will be able to compressed air, so the hole gravel loosened, to facilitate the washing.
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