hey harrrkevc : the tablets i think your talking about have been showing up at surplus stores for a few years now ....they are repackaged into a deep flimsy plastic case with a yellow label....these are NOT mp-1 tabs...these are chlor-floc tabs made in south africa...the big differance is when you use the tabs is that you HAVE to skim the residue the tablet collects, on top of the water being treated.....not always a easy thing to do in the field.. i remember the directions ask for a cloth to strain the water from one container to the other....again a slow clumsy thing to do in the field ..when i was in the 10TH mtn.div. we had these tabs given to us along with the issue iodine tabs ....after looking at the instructions on the box i just used my iodine tabs......vince g 11b inf..