E sebetsa libakeng tse kotsi tse nang le methane (tseo hangata li tsejoang e le khase) le ho phatloha ha lerole la mashala, tse khonang ho sebetsana le likhoerekhoere tse nang le motsoako oa lintho tse tiileng tse ke keng tsa qhibiliha joalo ka sediment, slime ea mashala, li-cinnders, fibrous material, joalo-joalo.
