How does filtration control microorganism?

Answer 1

By having physically small enough pores in the filter to actually strain microorganisms for the solution being passed through the filter. We are speaking in microns of width.

Answer 2

Filtration controls microorganisms by physically removing them from the water or air through a porous barrier. The size of the filter pores determines the size of microorganisms that can be captured. This process helps reduce the concentration of microorganisms in the environment, decreasing the risk of contamination and infection.