Sand Filter Backwash

The sand filter has been used as a liquid filter from time immemorial. The soil through which rain water passes on the way to the water table is the most basic of all sand filters. In industrial and environmental applications the filter is used to remove impurities from liquids in a controlled environment. As the filter becomes clogged, a backwash system is used to break up the caked sand during its backwash cycle. The sand filter engineer specifying the amount of air and pressure will normally give the volume in compressed air conditions (without any consideration for temperature changes). Not knowing this detail can result in the blower engineer, even at the factory or dealer level, undersizing the blower.
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