Where to Buy
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Here's what other sites are saying:
The SteriPEN Protector Opti water purifier is equipped with an optical water sensor for reliable performance so you can enjoy clean, purified water on the go.
SteriPEN Protector Pack
SteriPEN Adventurer Opti
SteriPEN Adventurer Opti with Solar Charging Case
MSR Guardian Purifier
$280 - $350
Potable Aqua Pure
$100 - $119
Platypus Meta Bottle + Microfilter
$25 - $49
MSR SweetWater Purifier System
$80 - $99