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The MSR SweetWater SiltStopper is a unique prefilter that fits any brand of filter or purifier to reduce need for cleaning. SiltStopper will increase the life of the filter by stopping all microscopic algae, silt and cysts that prematurely clog the primary filter. Allows the filter to focus on the truly tiny bugs that matter. Backflush to clean, filter element is replaceable (sold separately).