SteriPEN Classic 3 UV Water Purifier
Works very well, but is restricted to certain water containers due to size.
- Treats biological contaminants
- Requires strong batteries
- Only fits certain bottle sizes
I really love this product. However, it only works with certain bottle sizes. I don't enjoy the requirement of bringing heavier bottles that will fit the pre-filter. On the other hand, with good batteries, it lasts quite long.
It takes about 30 seconds to treat 0.5L, or about a minute for 1 L. This is fine for one person, but it eventually takes quite a while for a large group, with infrequent water sources (lots of water filtering). It requires stirring, so it's not easy like drops or a gravity filter.
I've used this product for 6 months, with dozens of days of use. All in all, it is a great product, as long as you're prepared for its drawbacks.
Source: bought it new