Botlolo ea metsi e tletse metsi a khalase, a sebelisetsoang ho hloekisa fensetere ea koloi. Metsi a khalase ke a lisebelisoa tsa koloi. Metsi a fenstere ea koloi a boleng bo holimo haholo a entsoe ka metsi, joala, ethylene glycol, corrosion inhibitor le mefuta e fapaneng ea li-surfactants. Metsi a fenstere ea koloi a tsejoa e le metsi a khalase.