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Sounds good.
Surfaces are still dirty, but anything nasty they contain gets blown away at a right angle to the filter. If you hold an agar dish downstream of a dirty jar, contams blow on it. If you hold an agar dish upstream of a dirty jar - the "dirtiness" of the jar is erased by the air flow.
Any time you touch a tool against a dirty surface, always flame it clean.
When changing containers/source material, I always sterilize the tools.
When changing between strains, always sterilize the tools.
Never let your hands get between clean work and the filter. There should always be a totally unobstructed (and short) line between the filter and whatever needs to be sterile.
Flow hoods aren't magic but they CAN drastically improve the success ratios of all sterile work (if ya use 'em right).
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