Inqubo yokukhiqiza ifakwe uhlelo lokuqoqa uthuli (ukukhishwa kwegesi kuhlangabezana nezindinganiso zikazwelonke), ngesilinganiso sokubuyisa ingilazi ephukile esingaphezu kuka-90%. Eminye imikhiqizo isebenzisa ubuchwepheshe obungenalo i-lead. Izitsha zokupakisha ingilazi zingaphinde zisetshenziswe ngo-100%. Izinga lokubuyisa ingilazi ephukile lidlula u-90%. Inqubo yokukhiqiza idinga ukufakwa uhlelo lokuqoqa uthuli, kanye nokukhishwa kwegesi kuhlangabezana nezindinganiso zikazwelonke.
Khuthaza ukusetshenziswa kobuchwepheshe obulula (izinga lokunciphisa isisindo ≤ 1.0).