1. Set mixing time(about 3~4 mins) and vacuum time(7~8 mins) 2. Put flasks into down chamber 3. Pour suitable water into mixing chamber, then add investment, after that start mixing and vacuum. 4. When mixing finished, buzzer alarms, then start pouring mixed investment into flasks, vacuum again, buzzer alarms again when vacuum finished. Finally take out the flaks which is full with investment.