{HEAD ~ The conduits} and {TAIL ~ the settler clarifer} for this alternate embodiment corresponding to those described above are represented by the same reference numeral followed with the letter a 
{ HEAD ~ The conduits } and { TAIL ~ the settler clarifer } for this alternate embodiment corresponding to those described above are represented by the same reference numeral followed with the letter a
HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH