Ukucindezwa ngokugayaya kuyisahluko esikhulu sendlela yokulahlekelwa kwebhelti yomqoka. Ibhelti yomqoka enegunya lokukhulula akuyona into eyodwa njengemibala kodwa yisici esibalulekile sokusebenza kwabanye bonke ababetsheli bezigaba eliphakeme. Kufezekwa ngokusebenzisa iribhini engcono yesayensi noma izinhlayiya ezihlaziywe ngendlela efanayo, ezihlanganiselwe ukuqinisekisa ukuthi zizimele kakhulu nokuba zingafanelekile, ngakho ke zinikeza igunya eliphezulu ekukhululeni kwehlathini eliqhubekayo nemphikiswano kumaqashi amadala ne-anthracite.
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