<prompt> Translate the following text to EnglishIkiwa pulsejet FF PJFF hutumiwa chini ya mto, kiwango cha sindano ya sorbent inaweza kupunguzwa hadi karibu 4.6 lb.  <response>: If a pulsejet FF PJFF is used downstream, the sorbent injection rate can be reduced to about 4.6 lbMMacf. 