A fixing carrier for fixing {TAIL ~ an activated sludge} employed in {HEAD ~ a sewage or waste water treatment} in which: 
A fixing carrier for fixing { TAIL ~ an activated sludge } employed in { HEAD ~ a sewage or waste water treatment } in which :
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH