The SteriPEN FitsAll Filter (FAF-ADP) allows you to remove particulates from water with the use of a durable 4 micron screen. It is recommended that particulates be removed prior to treating water with a SteriPEN UV purifier. The FitsAll Filter's unique design offers flexibility to filter water into bottles with a wide range of mouth sizes. Water can be poured through the FitsAll Filter or you can submerge the combined FitsAll Filter and bottle of choice. The SteriPEN FitsAll Filter cup and funnel fit into narrow-mouth bottles such as commercial water bottles, soft-drink bottles, canteens and SIGG bottles. On wider-mouth bottles, such as Klean Kanteen, Gatorade and Nalgene bottles, only the cup is necessary. The FitsAll Filter cup also serves as an adapter that allows the SteriPEN Journey or Classic to be used with these wide-mouth water bottles in the inverted position. Weighing only 65 g (2.3 oz.), the FitsAll Filter is made with rugged, flexible materials that allow the filter to be squeezed during storage and return to shape when unpacked. Nested storage dimensions are 88mm (3.5 in.) x 95mm (3.7 in.) x 72mm (2.8 in.).

SteriPEN is a hand held water purifier that uses ultraviolet light to purify up to 1 liter (32oz) of water at a time. There are no chemicals to taste or smell, no pumping or test strips, and no setup or clean up involved! The SteriPEN Classic Safe Water System (SP-SYS) is an all-in-one water treatment system that includes the SteriPEN Classic, Water Bottle Pre-Filter and a Nalgene BPA-Free wide-mouth water bottle. This system is all that is needed for treating drinking water while camping, hiking, backpacking or traveling. The 4 micron screen Pre-Filter fits snugly on the wide-mouth water bottle, protecting the drinking threads, and allows clear water to flow into the bottle while removing particulates. See the User's Guide to see how the SteriPEN Classic mates with the Pre-Filter. Ships with neoprene case for the Classic and User's Guide. SteriPEN utilizes C Wavelength UV (ultraviolet light). UV-C light is short wave light, between x-rays and visible light wavelengths, which destroy the DNA of microbes in seconds. Without functional DNA, microbes can't reproduce or make you sick.

The SteriPEN Classic with Pre-Filter Pack is perfect for those who already own a wide-mouth water bottle. Like the Safe Water System Pack (but without the bottle), the Classic with Pre-Filter pack is all that is needed when camping, hiking, backpacking or traveling. Use the 40x40 micron screen Pre-Filter to remove particulates from the water. The Pre-Filter is designed to be stored directly on the wide mouth bottle. Includes a neoprene carry case and User Guide.