Cool Hunt, Hunter.

Pros:

• It destroy waterborne bacteria and protozoa convert any freshwater to meet drinking water standards.
• It's lightweight and very easy to transport
• It is also very simple to use with no batteries or moving parts.
• Least expensive.

Cons:

• Users must drink directly through the straw to purify the water, so its not useful for transporting clean water.
• Does not remove viruses.