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Using A Water Filter On Shabbat

The Daily Halacha Moment - Using A Water Filter On Shabbat 🥤


״כל השונה הלכות בכל יום - מובטח לו שהוא בן העולם הבא״ (נידה עג ע״א, מגילה כח:)


“Anyone who studies Halachot every day is guaranteed that he is destined for the world-to-come” (Megilla 28b, Niddah 73a)


Question:

May one use a water filter on Shabbat?

May One use a brita on Shabbat?


Answer:

Most homes have a small water filter, called an aerator. Turning on the tap water does not constitute Meraked since this is a standard way of using the water from the tap, and the water that is coming out has already undergone many purification and filtration processes before coming out of the faucet.[1]


If one knows that the water has visible insects in it, it is prohibited to filter this water on Shabbat with a regular filter. Instead, one can place a cloth on top of a cup that has water in it, and then drink from the cup using the cloth as a filter as one is drinking. [2]


There are several types of water filter available on the market, known as “mini-bars” or filtration taps with a filtering system attached to one’s sink. Some people use a Brita filter on the tap or have a separate water jug that has a filter on the top when pouring the water in. Such filters are subject to major debate among the poskim, and it is proper to be stringent to not use such filters on Shabbat. One who is lenient has what to rely on if the water is drinkable without being filtered, even if one does not normally drink it unless it is filtered. [3]

Nonetheless, it is advisable to consult with one's rabbi regarding the permissibility of the water in one's area.


Excerpted from R’ Yonatan Nacson’s ‘Laws of Shabbat’, vol. 1 p. 380


Sources:

[1]. Chazon Ish, O.C. §53, “V’eim”; Az Nidberu 8:8; Minchat Yitzchak 7:23; Ohr LeTzion, vol. 2, 31:8; Yalkut Yosef, Shabbat, vol. 3, p. 292; Kovetz Teshuvot 1:37.

[2]. Shulchan Aruch 319:16; Chazon Ovadia, Shabbat, vol. 4, p. 222; Yabia Omer, vol. 11, 18:2. See also Piskei Teshuvot 319:34, footnote 298; Shemirat Shabbat KeHilchatah 3:60; Shulchan HaLevi 9:5; Chut Shani, Shabbat, vol. 2, p. 102.

[3]. See Yalkut Yosef, Yom Tov, p. 359 and in Birkat Yehudah, Brachah, 7:64-65 who brings many reasons for leniency. However, others, such as Halichot Shabbat, Malka, vol. 2, p. 473 write at great length about the possible issues of using such a system on Shabbat. Although, he allows using a Brita filter. See also Chut Shani, Shabbat, vol. 2, p. 38; Shevet HaLevi, vol. 11, 67:8; Orchot Shabbat 3:39; Hilchot Shabbat B’Shabbat, ch. 9, footnote 32. See also Kovetz Ohr Yisrael, vol. 68 who brings many different opinions on the subject.


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