Ukuba umthwalo othweleyo ngexesha lokusebenza uphantsi kakhulu, iibheringi zebhola zegroove ezinzulu zinokutyibilika phakathi kweebhola kunye neendlela zomdyarho, nto leyo ebanga inyonyo. Iibhola ezinkulu zegroove ezinzulu ezinebhola ezinzima kunye neekheji zithandwa kakhulu koku. Kwiimeko ezininzi, iibheringi zinokugqwala. Zininzi izizathu zokuthwala umhlwa, kodwa ezona zinto zixhaphakileyo kubomi bemihla ngemihla zezi:
1) Ukutywinwa kakubi kuvumela ukufuma, ukungcola, kunye nezinye izinto ezingcolileyo ukuba zingene;
2) Ukungasebenzisi{1}ixesha elide, ukudlula ixesha lokukhuselwa komhlwa, kunye nokungabikho kogcino.
3) Ukugqithiswa kwentsimbi yentsimbi;
4) Ukuba sesichengeni kwiikhemikhali ezonakalisayo; Ukungacoceki komgangatho wokuthwala, ukungcola kwindawo yokuthwala; Ukuphatha isiqhamo ngezandla ezibilayo; Ukungaphumeleli ukupakisha ngokukhawuleza okanye ukufaka i-bearing emva kokucoca, okubangelwa ukuvezwa kwexesha elide emoyeni kunye nokungcola;
5) Ubushushu be-Ambient kunye nomswakama, ukuvezwa kwimidiya eyahlukeneyo; Ii-rust inhibitors ezingasebenziyo okanye ezingekho mgangathweni.