Ubumba bemvelo obumbiwe ezindaweni ezisemaceleni emifula, ezindaweni ezisikiwe zemigwaqo noma ezindaweni ezivelile. Okuqukethwe kwabo kuyahluka ngokwendawo — ubumba obunensimbi eningi bubomvu uma bushisiwe, obunekaolin buba mhlophe. Kufanele bulungiswe (bucwiliswe emanzini, buhlungwe futhi buhlwengwe) ngaphambi kokusetshenziswa ekubumbeni izitsha, ekwenzeni impushana yombala noma ekwakheni.