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Is there a Halacha issue regarding a brita water cup on Shabbat (namely, borer)? Would this considered be separating or no?

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  • There is a Mishna Brura that discusses and permits this - 319 if I recall right - will aim to look for the source later
    – mbloch
    Dec 26, 2023 at 17:52
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    OC 319:10 MB 34, based on this poskim allow to filter for the one who drinks unfiltered water as well. For the one particular to drink only filtered water, R Nissem Karelitz permits, R Eliashiv and R Wosner forbid
    – mbloch
    Dec 26, 2023 at 17:57

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