Dora,<br><br>No, do not co-mingle the PA and PA plus. The PA plus will degrade the PA - that is what it does. The PA plus simply removes residual iodine taste from the water and has little or no effect with regard to killing pathogens. In fact - my opinion - by inactivating the residual iodine, the PA plus may actually be detrimental - think about it. I've never used it; iodine-tasting water is pretty easy for most folks to get accustomed to.<br><br>Someone else mentioned "aquaclear" in paper envelopes. I'm not sure, but I think what he's refering to is trademarked here as "Chlor-Floc", which you can get from Major Surplus and Survival and other places. My opinion on Chlor-Floc is that it is 1) bulky for the amount of water it disinfects compared to iodine and 2) a pain to use in a minimalist situation because it requires two containers and a "filter" (paper or cloth) to use. However, if someone is unable to ingest iodine, it probably is the best packable chemical disinfection method for water and is probably more effective against oocytes than plain iodine. It works by floculating suspended solids - all the bugs and dirt stick together in clumps - and then filtering them out with a coarse filter and treating the residual "clean" water with chlorine, IIRC.<br><br>Get in touch with Barry and get some small vials - you can repackage some PA tablets into MUCH smaller space that way.<br><br>HTH,<br><br>Tom