SteriPEN Water Purification System Pack

The product did perform as describe. I order two sets of the Lithium Ion battery from another source, one set worked and the other did not.
After a week of constant use, about 6 times a day, it needed a new set of battery. Rechargeable NiMH battery also worked in the unit.

I purchased the combination set with the bottle and pre-filter. The main advantage is the fileter adapter allows the SteriPEN to be inserted into the bottle and form a water tight connection. This makes it easier to shake or swire the bottle without worrying about spilled water.

It took me a while to figure out what was the sediment filter. I thought at first it was missing, but it was the funny thing sticking out the middle of the adapter. Removing the filter from the adapter allows the SteriPEN to be tightly inserted into the bottle. For most purposes, the filter serves no useful purpose, so I just put it away for safe keeping.

I used the unit to purified all my drinking water in Inner Mongolia and any water used to brush my teeth in any hotels in China. At the Beijing Airport, when leaving the country, it did raise some concern about what the device was, and added an extra step to the out processing when they attached a photo of me with a x-ray picture of the unit.

I will take the unit on my next back packing trip to truely purify my drinking water. I have never been sick from just using a water filter on previous trip, but this unit is convenient.

excellent at cleaning clear or clearer water, however when it went head to head with my MSR hand pump other than a bit more work i could pump a bottle of water just as fast as scooping up the water and them cleaning it. Will I stop using it heck no it is real cool and light weight.

I spent Memorial Day hiking in the San Gorgonio Wilderness with my wife and a friend. It's always beautiful there but this trip took a turn for the worse when I found that my water filter had cracked. This happened in a dry year when water flow in all the creeks was pretty low. Happily, some friends shared their steripen with us and I was amazed at how quickly we were able to purify water with the UV light. It takes about 45 seconds per quart. They had purchased the full system: steripen, pre-filter, and Nalgene bottle. It weighed considerably less than my filter even with batteries--under a pound. I'm sold and am purchasing my own. You can get the steripen and prefilter (good for removing particulates) separately, which I will since I have many Nalgene bottles, but if you are looking for a good all in one purification system, this is it.

This will keep the big little things from floating in your water. Only works in clear water.