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Water flows down through the filter Media , which is Sand with suitable size and uniformity characteristics. The water may flow under gravity or pressure.

Rapid sand filters must be cleaned frequently, usually daily, by Backwashing , which involves reversing the direction of the water. During backwashing, the bed is Fluidized and care must be taken not to wash away the media.


ADVANTAGES



DISADVANTAGES

  • The rapid sand filter is not an adequate treatment on its own.

  • It requires greater maintenance than a Slow Sand Filter and generally requires mechanical pumping of water, at least for backwashing. For this reason, it is not usually classed as an Appropriate Technology .



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