contamination question about phytoplankton culture

[salty joe]

So, I'm getting ready to culture some phyto and it seems like air being pumped into the culture would carry all manner of tiny living things.

Does the air need to be filtered?

 

[Brad Miller]

Many do not filter the air but it really should be.
You can get inline micron rated air filters like these...
https://www.amazon.com/gp/product/B07149NMRM/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1