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Is it allowed to make distilled water on the Sabbath, i.e. to begin before the Sabbath and let the machine continue to work even after nightfall?

The distiller works by boiling water and then condensing the steam. This makes very pure water.

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A process close to distilling water, is condensation from an air conditioner (doesn’t involve boiling, but it creates water from evaporated molecules). The water from an air conditioner is muktzah.

From the OU website;

The dripping water is muktzeh because it is classified as nolad gamur, newly created on Shabbos; Rav S.Z. Auerbach (Shemiras Shabbos K’hilchasah 13, note 130); Ashrei ha-Ish 17:221; Shevet ha-Levi 9:128; 11:204.

Edit:

Based on the comments, that perhaps the water that is made after Shabbos started is batul in the water that was made before Shabbos, the Shevet Haleve mentioned above 9:128 says that water would only possibly become batul in wine or some different liquid, but not water in water, as it is min b’mino.

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    In that case the water is all new on Shabbat. Here it was started before so maybe the additions are not nikkar
    – Double AA
    Sep 8, 2023 at 20:09
  • @Double More than maybe me thinks.
    – user6591
    Sep 8, 2023 at 20:28
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    The issue of nolad sheino nikkar is not a din in min bmino. Consider why can you put ice in your water glass?
    – Double AA
    Sep 8, 2023 at 20:38
  • @double AA There it’s dissolved straight into it. It doesn’t seem that’s the case with the distilling. It becomes water then gets mixed in after it goes through a filter into a different chamber
    – Chatzkel
    Sep 8, 2023 at 20:44
  • Isn't the condensed liquid already pure? Why filter it?
    – Double AA
    Sep 8, 2023 at 21:08

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