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5micron gas diffusion frit?

Any idea how effective a 5 micron gas diffusion frit would be as a CO2
diffuser?  Everything other than limewood so far produces rather large
bubbles.  Limewood produces tiny bubbles for a while then one of the pores
opens a bit and the bubbles get larger, reducing absorption in the column.
Sometimes the pore closes on its own and sometimes it needs "help."

I'm looking for something that would stay more consistent between weekly
water changes.