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Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers to report the effectiveness of air filters in more detail than other ratings.
The two conventional types of depth filter designs: the rapid and slow filters operate with velocities of 5–15 m/h and 0.1-0.2 m/h respectively; whereas pressurised sand filters have design flow rates of 238 L/min. [11] During operation the filter rate decreases due to increasing filter resistance as particulates get lodged within the media ...
[1]: 9–11 Rapid sand filtration has very little effect on taste and smell and dissolved impurities of drinking water, unless activated carbon is included in the filter medium. Rapid sand filters must be cleaned frequently, often several times a day, by backwashing, which involves reversing the direction of the water and adding compressed air.
Some diesel engines use a bowl-like design to collect water in the bottom of the filter (as diesel floats on top of water). [citation needed] The water can then be drained off by opening a valve in the bottom of the bowl and letting it run out, until only the fuel remains.
A media filter is a type of filter that uses a bed of sand, peat, shredded tires, foam, crushed glass, geo-textile fabric, anthracite, crushed granite or other material to filter water for drinking, swimming pools, aquaculture, irrigation, stormwater management, oil and gas operations, and other applications.
Hussam developed his filter after years of testing hundreds of prototypes. The final version contains 20 pounds of shards of porous iron, which bonds chemically with arsenic. It also includes charcoal, sand and bits of brick. It filters nearly all arsenic from well water. Awards
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