Before you attempt to sterilize your drinking water in the wild, pass it through the Hydro Photon SteriPEN FitsAll Filter to remove particulates. This highly portable system uses a durable 40X40 micron screen to quickly and easily remove stuff floating around in your water, and works with just about any water bottle you might happen to be carrying.
Four-piece kit includes an air vent, the filter cartridge, a durable, flexible filter cup, and a funnel for use with narrow-neck bottles
Can be used with all types of bottles with mouths of nearly any width
On certain wide-mouth bottles (Kleen Kanteen, Gatorade disposable, and Nalgene) the filter cut also serves as an adaptor for use with the SteriPEN Journey or Classic water sterilizers
Dimensions when nested: 3.5in (8.8cm) x 3.7in (9.5cm) x 2.8in (7.2cm)