Product review (1 stars): some work, some don't
These do seem to be 'overpressurised' somehow.  First one seemed to work well, second one seems to create bad tasting water even after a about 2 gallons of dumping water, according to my wife and daughter (6yo).  Will try the third one.

Convenient that you can only return them for a month after purchasing.... as if you're going to try them all out in a month and then just let them sit there for a year or so with water in them....

I will more than likely not buy these again.