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