The filter is equipped with certain valves and device which are incorporated in the outlet pipe system the propose of the device is to maintain a constant rate of filtration an important components of the regulation system is the venture mater which meager the bad resistant or loss of head when the resistant built up the operator open the regulation valves so as to maintain a steady rate of filtration when the loss of head exceed 1.3 meter it is uneconomical to run the filter.
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