I use Micropur solely, and find it is a great tool if used with 2 water bladders. I usually start with 2 Liters of water in a 2L Platy. After I have finished the first liter of my 2L platy, I fill a second 1L platy with water and treat. By the time I finish the rest of the water from my 2L platy, my 1L platy should be good to go. And I continue along these lines. Before I go to bed, I fill my 2L and treat, then drink from my 1L during the night. I'm not so good with wording it so it may sounds complex but it works great! I don't wait the 4 hours recomended, just the time it takes for me to drink 1L of water.