this might be a stupid question but i have been looking around at more and more filtration systems. I have read that bacteria are .2+ size, protazoa are .3+ size and viruses are something like .013 or something like that. Most of the filtration systems mentioned and that i have been looking at say a .3 gaps size. Should i be concerned that this is to large and it will only take care of the big stuff? I know nearly no filtration system can get rid of viruss with out chemical help, but what about bacteria? I have looked through the search option on here and on the internet but i am really struggling and you guys are a wealth of information. sorry for the newb questions though.