Generally the concentrate may be entrained in a product or introduced directly into {HEAD ~ the environment} of {TAIL ~ use} 
Generally the concentrate may be entrained in a product or introduced directly into { HEAD ~ the environment } of { TAIL ~ use }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL