In Step 21, the solution containing {TAIL ~ solid microparticles} is continuously pumped into {HEAD ~ the apparatus} 1 for collecting solid microparticles floating in water even after the full water level is reached 
In Step 21 , the solution containing { TAIL ~ solid microparticles } is continuously pumped into { HEAD ~ the apparatus } 1 for collecting solid microparticles floating in water even after the full water level is reached
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH