The article presents the thorough description of the vertical flow sand filters. The construction of sand filters was also presented and materials used for building filters were described. In the next part, capacities of sewage treatment in the vertical flow sand filters were presented. Vertical flow sand filters are mainly used as the second step of sewage treatment after septic tanks or after Imhoff tanks, as well as the third step after biological treatment processes when the high quality and stable outflow is required. Sand filters are useful for treatment sew-age from single households and from the group of houses, but they also can be used in bigger sewage treatment plants for the public utility objects. The article ends with the summary and conclusions where it is ascertained that the vertical flow sand filters are very good solution regarding household sewage treatment plants, in the areas where the combined sewerage system can-not be applied. Moreover the efficiency of sewage treatment in these objects is high.
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