Here's what other sites are saying:
When you need clean water in a hurry, you want a SteriPEN Quantum water purifier. It is dependable and full-featured, delivering 1 liter of purified water in 90 seconds.
Where to Buy
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SteriPEN Classic 3 UV Water Purifier
$62 - $79
SteriPEN Ultra UV Water Purifier
$100 - $109
MSR Guardian Purifier
$260 - $349
$45 - $59
SteriPEN Adventurer Opti
$67 - $99
Platypus Meta Bottle + Microfilter
$35 - $49