[ Problem Point ]
It was troubled to be contaminated with airborne bacteria breeding in the liquid directly in the aeration air.
[ ⇒Kaizen Point ]
The aeration was done after heating was sterilized by the Air Blow Heater.
Airborne bacteria were sterilized by heating,so liquid wasn’t polluted and became good.
Related page:
No.5 Heat-shrinkable tubing 
No.34 Partial heating of the culture medium 
No.36 Sterilization of spatula 
No.47 Replacement of gas in laboratory electrified 
No.65 Small high-temperature tunnel furnace heat source 
No.71 Manufacturing of superheated steam 
No.79 Thermal Diffusion test of perfumes 
No.99 Culture of anaerobic microorganisms