Are you allowed to filter tap water on Shabbos, or is it borer?
Assuming that there is no electrical process involved, water may generally be filtered on Shabbos. There is no concern for borer (separating) because the water could be imbibed even without the filtering and the filtering is only for added purity. Additionally, the filtering of tap water is usually only for chemicals invisible to the eye and does not violate the prohibition of borer. (In locales where water is not permitted without filtering due to insect infestation, filtering may be prohibited on Shabbos. Consult your Rav.
Assuming that there is no electrical process involved, water may generally be filtered on Shabbos. There is no concern for borer (separating) because the water could be imbibed even without the filtering and the filtering is only for added purity. Additionally, the filtering of tap water is usually only for chemicals invisible to the eye and does not violate the prohibition of borer. (In locales where water is not permitted without filtering due to insect infestation, filtering may be prohibited on Shabbos.
