Libaka tse kholo tsa 'masepala le libaka tsa polokelo ea liphoofolo li silafatsa metsi ka ozone ho sireletsa mefuta e fapaneng ea tšoaetso khahlanong le tšoaetso le mafu a bakoang ke metsi.Ozone e senya libaktheria, e etsa hore livaerase li sebetse, 'me e oxidize lintho tse phelang.Metsi a hloekile, a hlakile, 'me a bolokehile.