The tablets are a great thing. The dosage is easy. One tablet + 2 hours waiting = 1 liter of drinking water. The active ingredient is a mixture of chlorine and silver ions. So that water can be stored. You can prepare the drinking water for the whole day or the whole week so am. The only drawback is the stringent smell of chlorine and the resulting taste impairment of the water. However, since this is in the nature of things, I think it is not justified to give a deduction in the product evaluation for this purpose. This product can prevent the user from complicated diseases related to contaminated drinking water, you can not do in the bush far from a doctor's office. I myself use it on the road as a last resort in the event that the ceramic filter fails.