I hate to be "that guy" who veers a thread off course, but I am done with filters. They are too damn slow, the straws are too tiring on my throat and cheek muscles (don't even think about saying it Deflave) and too much crap to carry.
I am going back to drinking straight out of springs (never, ever had an issue but have heard too many giardia stories) but probably also will carrying coffee filters and an eye dropper full of bleach. The coffee filters get the big stuff out and the bleach works pretty well to kill anything in there. I've heard the bad stories about drinking bleach, but I use only a drop in a 32 OZ bottle and I would rather suffer those effects than giardia.
