Since the 5 micron filter backwash is separate from {HEAD ~ the backwash} of {TAIL ~ the other filters}, it can have a separate sensor and a separate cycle 
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Since the 5 micron filter backwash is separate from { HEAD ~ the backwash } of { TAIL ~ the other filters } , it can have a separate sensor and a separate cycle
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH