This thing is no joke! I took it backpacking on Maine's Bigelow range. When I ran out of the water I brought, I was A-ok with this. Just bring a wide mouth bottle to fill with water you find. On top of one of the lower peaks, I drank from the most disgusting looking crevice filled with brown scum (see photo). I thought, this is going to be safe, but taste horrid. WRONG. TASTED LIKE THE FRESHEST SPRING WATER. Better than any tap. I'm from Maine, and I've tasted plenty of water right from mountain springs, so take my word. One caution: it can be a little challenging to start. You have to prove it by soaking. If it still doesn't work, blow into it a bit.

not tested seemed ok

I've used these both in Iraq & Afghanistan. Works as advertised. Extremely reliable and genuinely safe to use filtration system. We now use it as a SOP to have one in everyone's ruck when we deploy! Semper Fi.

lo que se esperaba... espero no tener que usarla por necesidad

todavía no lo he probado, pero la primera sensación a sido muy buena y de calidad.