I just got mine in the mail today and gave it a test. I thought I was taking it fairly easy on it and decided to put 10 minutes on the kitchen timer. I started to filter 2 liters of water and just as I filled the bottle and started pouring the excess into my drinking glass the alarm went off. I know I could easily improve that time too. I wasn't rough housing the bag, dont have much faith in it yet. I'm sure I'll figure out and always bring a back up in case the bag breaks. Most likely an empty 2 litter so I can rig it like a gravity set up. Only take a minute to set it all up and then set your tent up and should have enough water for the whole evening. I like that idea big time. Oh I forgot to mention to that I don't know what it took out of our water but I think it taste a whole world better then it did before. I know we have hard water and sulfer and there is a peroxide drip added to the water to kill the sulfer taste and smell.