User Review: Katadyn Exstream XR Bottle Purifier
Price Paid: $30
You guys having trouble getting water out of it, should take the seal off the top of the virustat cartridge. There is a little plastic protective seal on the top of the new cartridge. The directions are printed on the side of the bottle.
I use mine on short hikes on the AT. It works great. No worrying about the crud. And its so fast and convenient. Just dip and sip.