Question

In purification of water, optimum
period of storage of river water is
O A. 4-6 days
O B. 6-8 days
C. 7-14 days
O D. 7-21days​

Answer 1

Most deep groundwater does not need screening before other purification steps. Storage – Water from rivers may also be stored in bankside reservoirs for periods between a few days and many months to allow natural biological purification to take place. This is especially important if treatment is by slow sand filters.

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