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The pressure sand filter system shall be provided with:
1. Gauges for each battery on the inlet and outlet pipes for determining loss-of-head in filter media.
2 Air releases with a manual control on the highest point of each filter.
3. A readily removable head or a large manhole to facilitate inspection and repairs.
4. A rate-of-flow indicator having satisfactory range shall be provided. It should be located in the recirculation line so that the rate of flow either during normal circulation or during the filter backwashing operation can be determined.