Water filters are used to separate impurities from water. This process can be done by using physical barriers, different chemical processes, or biological means. Filters are necessary for drinking, irrigation, and swimming pools.
There are many different types of common filters. There are media filters, which use sand to filter water as it moves from below the rock and sand to the surface. Screen filters, which utilize a screen that separate fine particles out of the water for irrigation among other things. Disk filters are the main water filters for irrigation. It is much like the screen filter, but instead of a screen it uses small disks stacked on top of each other in order to separate the impurities.
When raw water is in need of treatment slow sand filters can be used. They are usually a length of one to two meters deep. A layer of earth, called the Schmutzdecke layer, which uses bacteria and fungi to purify the water. Using this process exceptionally clean water is left on the surface of the earth.
Rapid gravity filters, or rapid sand filters are used in municipal water treatment facilities. Particles in the water are removed by coarse sands that are trapped in flocks by salts made up of iron or aluminum. The simplest filter that is still being used today is definitely the cloth filter. It is used by placing a folded cloth in a container that is dipped into the unfiltered water. The container is then raised from the water and the cloth lifted from the container. The filtered water will move through the cloth and into the container. This form of filtration is not very safe or effective, so be cautious when this process is in use.
There are more complex forms of filtration that do not require physical screens in order to allow the filtration to take place. Ultra violet rays can be used as a form of filtration that is very effective. Exposing water to ultra violet rays can remove any viruses and bacteria that might have resided in the water. This process is usually used in raw water applications but has an increasing use in drinking water. Construction of a drinking water disinfection facility using these rays has already been approved in New York. The facility will be capable of producing two billion gallons of clean water daily.
Reverse osmosis is a process in which pressure is applied to a membrane forcing water through it. The impurities in the water are trapped within the membrane as the water flows out the other side. Most of the separation occurs within the polymer matrix, which is the outer layer of the membrane. The membrane is known as the semi permeable, because it only lets the solute pass through while collecting the solvent.
Catalytic converters are devices using filtration for the benefit of the environment instead of strictly humans. The converter is put on automobiles in order to reduce toxic emissions into the environment that are made by the vehicle.
Water filtration is one of the most beneficial ideas the human race has proposed. Early forms of water filters allowed man to live in some of the harshest climates on earth. There will never be a time when water filters are not necessary for our survival.
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