This is my 3rd UV-C purifier. 1st was an early gen. SteriPen. Issues with the operation which Steripen has corrected (electrodes not reading immersion under certain water conditions). 2nd was a mUV. Nice compact & very light, but the internal rechargeable & non-user replaceable battery no longer holds a charge. diy gravity/squeeze filter + chlorine dioxide tabs are my primary backpacking wa
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