I am wanting to sparge tube cultures of a bacterial culture to promote gas transfer and provide some mixing in tube cultures. Can anyone recommend an optimal choice between: A (145-174 micron), B (70-100 micron), C (25-50 micron), D (10-20 micron), or E (4-8 micron)

Of course smaller porosity should lead to better mass transfer but other problems such as fouling and excessive back pressure may be a problem at low sizes.

Many Thanks, Chris

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