As the activated carbon, {TAIL ~ a phenol type}, a rayon type, {HEAD ~ an acryl type}, a pitch type or a coconut shell type may be used 
As the activated carbon , { TAIL ~ a phenol type } , a rayon type , { HEAD ~ an acryl type } , a pitch type or a coconut shell type may be used
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH