For the Fish River Canyon hike we needed to be water-wise. In our group we had 4 of these bottles. They did their job in filtering the water both from sand and bacteria*.. sometimes even algae when the need was great. The only down side was that 3 of the 4 leaked, some more than others. All in all the bottles did what they needed to: filter safely.
*To be on the safe side we also a Read more
I would recommend this product to a friend.