The benefits of the instant flotation system are increased particle collection rates and a reduced column height in {HEAD ~ comparison} to {TAIL ~ conventional columns} 
to
The benefits of the instant flotation system are increased particle collection rates and a reduced column height in { HEAD ~ comparison } to { TAIL ~ conventional columns }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL