Waiting 24 Hours Before Kashering

One must wait twenty-four hours after a utensil has become treif before it can be kashered through hag'alah (using boiling water); additionally, the utensil has to be completely clean. Alternatively, a utensil can be kashered within twenty-four hours provided that the kashering pot contains shishim (sixty times more water than the volume of the utensil bring kashered). However, it is customary to always wait twenty-four hours before kashering, even if the kashering pot contains shishim. Kashering utensils at a public kashering station raises the following issues: it is difficult to ascertain whether other people kashering their utensils in the same kashering pot have indeed waited twenty-four hours after their item has become treif (non-kosher), and whether the water contains shishim. To circumvent these problems, and to avoid impacting the kashrus of the other utensils being kashered at the same time, bleach or a similar liquid—which alters the water’s taste—should be added to the water. Nevertheless, lechatchilah (preferably), one should use pure boiling water for kashering, and not water with another liquid added.


Practical Halacha: One minute a day. By Horav Yosef Yeshaya Braun, shlita, Mara D'asra and member of the Badatz of Crown Heights.