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Water filters on Shabbos

Question: Recently a number of Rabbonim have ruled that water filters installed under the sink, which retain water in the filtration chamber in between uses, in which the water sits mixed with charcoal particles, are forbidden to use on Shabbos because of the melocha of Borer. What is the Rav’s ruling on this matter? Answer: These filters should be treated no differently than all standard filters. Therefore ...

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