{HEAD ~ The algal spores} are subjected to floway {TAIL ~ operating conditions} so as to grow algae forming an algal turf in the flowing water 
{ HEAD ~ The algal spores } are subjected to floway { TAIL ~ operating conditions } so as to grow algae forming an algal turf in the flowing water
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH