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Bobble bottles use a carbon filter made of activated charcoal. The fibers that come out from the filters initially are knocked loose off of the internal filter fragments. These are completely safe to ingest as they are just harmless carbon, but they advise on the packaging of the filter that you should run a few bottles of water through the filter first to clear them out prior to actual use. These will stop coming out after a few rinses, but some people don't bother reading the packaging or attempting more than one rinse so they don't realize this.

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10y ago

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