diatom filters & green water

Will a diatom filter clear up suspended algae? (i.e. will a Vortex
filter (or equivalent) filter out an algae bloom ("green water")?)

How big are those critters (the algae, that is)? Diatom filters are
supposed to catch things down to 1 micron.

Dan Resler

Dept. of Mathematical Sciences            
Virginia Commonwealth University           
Richmond, VA                                    
23284-2014 USA
email: resler at liberty_mas.vcu.edu