SteriPEN Prefilter for water purification

After buying Steripen, I still boiled my water for awhile, but now have total confidence in this product. Couldn't be easier to use. Now I'm saving lots of stove fuel and drinking healthy water. The prefilter is a MUST in combination with the Steripen. Clear, clean water.

It arrived in a timely manner as expected. What more can I say it is a prefilter it does as it states keeps the sediments out. Works fine.