Abstract
AbstractThe filter‐technical equipment of seven water works in a tropical region of India is described. The structure of the filter sand layer, the grain size distribution and the degree of uniformity are compared by means of tables. The uniformity coefficient of a good filter sand is smaller than 1.7. Besides physical properties, also the surface properties of the filter sand grains are of interest. Different analytical methods for determining the incrustation are described. The amount of the filter grain load also depends on age, i.e. on the service life of the filter sand. The efficiency of a filter plant is determined also by the regeneration process, i.e. by back‐wash. This includes the methods of scouring with water only and the back‐washing with water/air.
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