Sand Filter

Sand Filter

Sand filters are used for water purification. There are three main types;

  1. rapid (gravity) sand filters
  2. upflow sand filters
  3. slow sand filters

All three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively whilst slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids.

Read more about Sand Filter:  Sand Bed Filtration in Context

Famous quotes containing the word sand:

    Change begets change. Nothing propagates so fast. If a man habituated to a narrow circle of cares and pleasures, out of which he seldom travels, step beyond it, though for never so brief a space, his departure from the monotonous scene on which he has been an actor of importance would seem to be the signal for instant confusion.... The mine which Time has slowly dug beneath familiar objects is sprung in an instant; and what was rock before, becomes but sand and dust.
    Charles Dickens (1812–1870)