Advice on water filter systems

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Are these virus filters a new product, as I did try to go through filters quite extensively a while ago and do not remember seeing most, exept the lifesaver.

Having had terrible poisoning, and thinking about the prevolance of hepatitis, and the dense populations in the uk, my biggest fear is water left warm overnight, in a dark bottle, with food for the organisms to feed of. If they strip the viruses out of water are they proficient enough to stop contamination breeding in the bottle, and what are the failsafes of the system? Is it better to still use chlorine or chemical treatments? I noticed that the floculants REMOVE entirely metals and chemicals, what are the virus filters like at bacteria food metels and chemicals?
 
If you have filtered out all bacteria and viruses, and your bottle is clean, then there is nothing in the bottle to reproduce. The .02 Sawyer filters outviruses, and anything bigger than viruses, such as bacteria.
 
Yep, but no good when on the go, and of course isn't going help to with metals and chemicals. Still a decent idea for those living in undeveloped countries, but not useful for us.
 

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