Hence, where {HEAD ~ anhydrous sodium perborate} is {TAIL ~ the effervescent agent}, a higher pH is preferred, e.g., 8.0 to 9.0 
is
Hence , where { HEAD ~ anhydrous sodium perborate } is { TAIL ~ the effervescent agent } , a higher pH is preferred , e.g. , 8.0 to 9.0
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH