I love having inline purification. I can pump water straight into my bottle and flip a switch without having to wait and stir a pen around. (I cary the pen though just in case this one goes out) I was hesitant at first, mainly due to how much of a beating my water bottles go through but the manufacturer provides a LIFETIME warranty at no extra cost. With my experience the battery life in this is longer than that of Steri-Pen. This bottle is one of the best UV purification tools on the market.
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