automatic backwash sand filter

automatic backwash sand filter: Горное дело: песчаный перколятор с автоматической обратной промывкой, песчаный фильтр с автоматической обратной промывкой

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Swimming pool sanitation — articleissues refimprove = January 2008 technical = August 2008Swimming pool sanitation refers to both visual clarity and levels of microflora, such as bacteria and viruses in swimming pools. The goal of sanitation is to prevent the spread of… … Wikipedia
Water injection (oil production) — The water injection method used in oil production is where water is injected back into the reservoir usually to increase pressure and thereby stimulate production. Water injection wells can be found both on and offshore. This method is used to… … Wikipedia

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