If I were in the Tsunami-infected zone, I would prefer the Katadin water sterilizer/filter. It is based on a silver-bearing artificial ceramic filter. I think it pre-dates the FDA and is therefore grand-fathered for importation from Switerland, where it was invented many years ago. It either kills or blocks pathogens over a vast range of sizes, from viruses to protozoa. Toxicity is not an issue. Its one drawback: it is not cheap.
But even the Katadin sterilizer/filter should be supplemented with a container additive like EIS, if the water is not used immediately. Best regards, Matthew
