gets the job done

By js1924119 Ranked #277 - Water Filters July 26, 2010

Really easy and efficient way to get the sand and other particulates out of your water. Just twist it on your nalgene, dunk it in the water, and then Steripen the water. I have the Adventurer Opti steripen, so I have to take the pre-filter off to use the Steripen, but if you have the models that nest into the pre-filter, all you have to do is pop off the filter screen and insert the steripen. HydroPhoton says the pre-filter forms an air tight seals with the groves on the nalgene, eliminating the need to worry about unpurified water on the rim of the water bottle. To be safe I always give it a wipe down, and then once I've purified the water, I turn my bottle upside down with the cap just barely on to rinse watevers left with clean water.

Highly recommended if you are using the Steripen system to filter your water. For 12$ and no extra weight, it makes sense to get this.

View Details: Hydro Photon Water Bottle Pre-Filter

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