The SteriPEN Water Bottle Pre-Filter filters out debris prior to zapping with your SteriPEN UV lamp. The SteriPEN Pre-Filter filters out particulates larger than 17 micron for clear water. It's like baleen for murky creek water.
- Fits snugly on Nalgene® and comparable wide-mouth water bottles
- 17 micron filter (one micron equals one millionth of a meter) keeps sand, dirt, tiny debris from
- O-ring prevents untreated water from back flowing and contaminating bottle lip or threads
- Replacement cartridges available
- Use filter prior to purifying, the Pre-Filter clarifies water only; is not a substitute for water sterilization