Why do most of the forum members seem to use Iodine for water treatment and not Chlorine based products? I have used Chlorine based PuriTabs for years and have not had any problems at all, they have a long shelf life and do not need special containers like glass and PTFE(which seem to take quite alot of time discussing).<br>I first used them in the British Army and belive that if the are standard issue to soldiers they must be pretty 'squaddy-proof'.<br>Any comments? Can you get Chlorine based products in the USA?<br>