In nature we find pure water in springs and in deep wells while polluted water resorces are found in nearby locality. Water filter from other resorces and avilable as consumable water in nature due to the similar phenomina occured under ground in this manner.
In the above figure you can see the recepter compartment consist of flow diversifying structure to spread the flow on a wider area. If this type of structure is not constructed the upword flow will take part at the closest position to right hand side compartment. To perform this action only a little pressure head is required. It does not require the expensive construction of a suspended sand bed. This is better in performance
These sand filters are built in a watertight container which is usually concrete or fiber based material for better performance. Such recirculating filters require only 1/4th of the area that any other type needed.
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