Slow Sand Filtration 1974

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The object of this volume is to discuss the various aspects of one particular form of water treatment–the “biological filtration” or “slow sand filtration” process. This system of water purification has been in continuous uses; – – the beginning of the nineteenth century, and has proved effective under widely differing circumstances. It is simple, inexpensive, and reliable and is still the chosen method of purifying water supplies for some of the cities of the world. A myth has grown up that this process is old-fashioned and therefore inefficient, that new techniques have rendered it obsolete, and that because it is simpler than many more recent innovations it is necessarily inferior to them.

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