Le yi-intshi ezi-9 ubude obuthe ngqo obunegumbi elinye.Omabini amagumbi aneengalo zomthi weengalo ezi-4 ezifanayo.Ijongeka ngathi yi-perc bong yomthi okanye i-bong yokubamba uthuthu kuba akusekho magumbi okuhlala umsi.Ke, kulula ukufumana ukubetha ngokugudileyo xa iingalo ezininzi ze-percolator yomthi zikhona kwaye zifake umsi emiphungeni ngokukhawuleza.I-tree perc ibangela umsi ukuba uhlanjwe emanzini ngokupheleleyo.Zonke ii-bongs zinezixhobo ezihambelanayo.
