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