1 micron?! No way! That is a diatom filter! My diatom is only rated to .8 microns. What would you use these for? Wouldn't they clog instantly? What kind of flow rate can you get out of this bag?
If used in series...from larger to smaller...then no they don't clog as quickly as you might think...
That said...the 10...5...and 1 mic bags are usually used only occasionally for water polishing. The 1 mic bag is also VERY good at removing free algee from the tank water.
Yeah, no crap! In fact bacteria can't even get through that. I was under the impression you were using it as a media bag. You use the 10 & 25 for media?
As far as the free floating algae, IMO UV is much better. Nothing to buy, change, rinse, or clog