morph, the prefilter will not work on the adventure, it will work on the steripen (original), you can get the same results with a head bandanna. There was a guy came back from India on a different forum and used it in very dirty water, almost sewage type and he said he had no other options at the time and treated the very murky water several dosages and said it tasted very bad but never got sick. The Steripen will not change the taste, it only kills the critters.