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|Halacha - Shabbat - Borer|
|Submitted by Adi Salama Answered by Rav Peretz Moncharsh|
|Answer: Borer does not necessarily need to be visible, however borer does need to be between two distinct items and would not apply to separating say large apples from small ones. The microscopic contents of the water would be considered water as well, and based on this should not be borer. However if someone is makpid, careful not to consume the water without filtration, his strong personal preference creates a situation where the impurities are considered a separate entity and borer will apply.