Is filtering water through garments (sudarim) forbidden on Shabbat due to laundering (libun)?
Synopsis
The Mechaber says filtering water through garments is forbidden due to laundering. The Magen Avraham and Gra disagree on the reason: the Gra says it is not actual laundering but concern for wringing (sechitah), and garments designated for straining are permitted even for water.
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Discussion
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