Izifudumezi ezifunxayo zisetyenziselwa ukufudumeza iimveliso ngaphakathi kwitanki zokugcina, ngakumbi xa ezi mveliso ziqinile okanye ziqinile ngokulinganayo kumaqondo obushushu aphantsi.… Ezona nkqubo zixhaphakileyo zokusetyenziswa kobu bugcisa zezokufudumeza iitanki ze-asphalt, ibhitumene, i-oyile yamafutha anzima nezinye.