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The hagala water must actually be boiling, and this is a sine qua non with regard to utensils that have absorbed ĥametz as a kli rishon on the fire. As we have learned, the practice, le-khatĥila, is to perform hagala on all utensils in a kli rishon over fire.
The entire utensil must be submerged in the water for a few seconds. 15 Sometimes the immersion of utensils cools the water to the point that it stops boiling. In this case, the utensils should be left in the water until it returns to a boil.
If a utensil cannot be immersed in its entirety into the water, it can be immersed one half at a time (SA 451:11).
Furthermore, when immersing two utensils into the boiling water at one time, one should shake the utensils to ensure that the boiling water circulates between them (based on SA 452:3-4).
Common practice, le-khatĥila, is to rinse the utensils with cold water after hagala, so that the hot water does not remain on them and cause them to reabsorb the taste released during hagala. This is not essential, however, since hagala is normally performed when the utensil is not ben yomo or in water that has a foul taste, so that even if the utensil reabsorbs the taste of the water, it will not be rendered un-kosher (SA 452:7; MB ad loc. 34). Therefore, one should not rinse utensils with cold water if this is liable to damage them. Likewise, if for some reason it is difficult to rinse a utensil with cold water, one need not make an effort to do so.
Though some people have reservations about performing hagala on their utensils, the procedure is actually quite simple. In brief: First, one cleans the utensil and waits twenty-four hours after it absorbed forbidden food. Next, one immerses the utensil in boiling water. If it is possible to take it out and rinse it immediately in cold water, this should be done, but if it is difficult, one may extinguish the fire under the pot of boiling water, wait for the pot to cool down somewhat, and then pour out the hot water, and rinse the utensil a bit in cold water. One may use any pot in the kitchen for hagala, provided that it has not been used for cooking in the previous twenty-four hours. 16
13.Koshering Pots via Hagala
We have seen that in order to kosher a pot used to cook ĥametz (barley soup, for instance), it must be immersed in boiling water. When the boiling water inundates the vessel on all sides, it extracts the taste of the ĥametz from it. Based on the principle of ke-bole’o kakh polto, it ought to be possible to kosher such a pot by simply boiling water in it, and the pot will expel the taste just as it absorbed it. However, during the course of the year some cooked foods certainly boiled over the sides of the pot, causing the absorption of taste along the pot’s rim. The taste would not be released by water boiled inside the pot. Thus, in order to kosher such a pot for Pesaĥ, it must be completely immersed in a large vat of boiling water.
If one cannot find a vat large enough for immersing the pot one wishes to kosher, the poskim suggest the following: fill the pot you wish to kosher with water and bring it to a boil. At the same time, heat a stone so that it becomes scorching hot. When the water boils, insert the scorching hot stone into the pot. This will cause a lot of water to spill over the sides of the pot, koshering its rim and its outer walls.
This method is effective where a vessel has absorbed ĥametz through overflow, but if a pot was inserted into another pot and absorbed taste, it has absorbed in a kli rishon, and hagala by the overflow method is not effective. Instead, it must be koshered through complete immersion in boiling water (SA 452:6; MB ad loc. 31).
It is difficult, however, to heat stones in this manner in domestic kitchens. Therefore, a possible alternative is to boil water in a small vessel, and when the water in the large vessel begins to boil, insert the small vessel into the center of the larger vessel. This will cause the water in the larger vessel to overflow and kosher its rim and outer walls.
If the pots have removable handles, it is proper to remove them and perform hagala on them. However, if the handles were not removed, and one cleaned around them with plenty of soap and then performed hagala on them, the pot is kosher.
Another problem is that many pots have a lip along the rim and on the edges of the cover where food sometimes gets stuck. The preferred practice is to heat these areas with a blowtorch in order to incinerate the residue found there. However, one need not be meticulous about this, because the pot goes through enough rinsing and cleaning with detergents to render the taste of any residual food foul and unfit for a dog’s consumption, so that it does not even have the status of ĥametz. Therefore, if a blowtorch is used, its flame should not be directed at one place for too long, because doing so might damage the pot’s nice appearance. When necessary, one who cannot perform light libun on this lip may suffice with hagala. 17
14.Absorption through Pickling ("Kvisha") and Its Koshering
Utensils into which cold ĥametz has been placed do not require hagala in boiling water; a thorough washing is sufficient to kosher them for Pesaĥ. For example, beer mugs become kosher for Pesaĥ by means of a thorough washing, even though beer is ĥametz gamur, because as long as the ĥametz in a utensil has not reached the temperature of yad soledet, the utensil does not absorb the taste of its contents. Certainly, then, a cake plate used for ĥametz can be koshered for Pesaĥ with a thorough washing, because in addition to the fact that cookies never reach yad soledet, they are dry, and taste does not transfer to a utensil without a liquid medium.
But if beer is left in a mug for more than twenty-four hours, kvisha ("pickling," or the absorption of taste through prolonged soaking) occurs, and the taste of the ĥametz gets absorbed into the glass based on the Sages’ rule: "kavush ke-mevushal" (pickling is akin to cooking). Therefore, it is forbidden to use such a utensil on Pesaĥ unless it has been koshered.
Utensils that have absorbed taste via kvisha can certainly be koshered through hagala in boiling water; if hagala is effective on utensils that absorbed via cooking, it certainly works on utensils that absorbed via kvisha. Moreover, since kvisha is a milder form of absorption, one may kosher such a utensil by soaking it in water for three twenty-four hour periods: First, one places the utensil in water and leaves it there for twenty-four hours. Second, the water is changed and the utensil is left there for another twenty-four hours. Then the water is changed once again, and the utensil soaks for a final twenty-four-hour period. Nevertheless, this method of koshering is generally not helpful because it is faster and easier to perform hagala with boiling water. But when dealing with utensils that are liable to be damaged by boiling water, soaking in water for three twenty-four-hour periods can be a very useful solution.
It is also worth mentioning that when it comes to alcoholic beverages such as whiskey, some poskim are of the opinion that the taste of the ĥametz is absorbed by the glass in a mere eighteen minutes. Thus, if one wishes to use such a glass on Pesaĥ, it must first be koshered using one of the aforementioned methods. 18

The Month of Nissan - A Unique Possession
Rabbi Chaim Avihau Schwartz | nissan 5762
