I-rumen iyingxenye ebalulekile yesistimu yokugaya yenkomo ephula i-cellulose nezinye izitshalo zezitshalo. Kodwa-ke, ngenxa yokuthi izinkomo zivame ukuhogela izinto zensimbi lapho zigwinya ukudla, njengezinzipho zezinkomo, izintambo zensimbi, njll., lezi zinto zensimbi zingase zinqwabelane ku-rumen, zibangele izimpawu zomzimba wangaphandle. Umsebenzi kazibuthe we-rumen ukumunca nokuqoqa izinto zensimbi ku-rumen, zivimbele ukuthi zingacunuli udonga lwe-rumen, futhi zidambise ukungakhululeki kanye nezimpawu ezibangelwa imizimba yangaphandle ku-rumen. Iuzibuthe we-rumenidonsela into yensimbi ngozibuthe, ukuze igxile kuzibuthe, ivimbele ukuthi iqhubeke noma idale umonakalo odongeni lwe-rumen.