Botlolo ea metsi e tletse ka metsi a khalase, a sebelisoang ho hloekisa moea oa koloi. Metsi a khalase ke a likoloi tsa koloi. Metsi a phahameng a boleng bo phahameng a moea o na le metsi haholo, a notleloa haholo ka metsi, joala, glycol, securion inhibito le mefuta e fapaneng. Metsi a foro ea koloi a tsejoa hangata e tsejoang e le metsi a khalase.