The outlet filter screen of the primary treatment tank should be cleaned as necessary to ensure proper operation. The filter cartridge must not be removed unless provisions are made to retain solids in the tank that may slough off the filter when removed from its enclosure. If the filter is equipped with an alarm, the filter should be serviced if/when the alarm is activated continuously. Occasional short duration filter alarms may inidicate surge flows or an impending continous alarm.
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