Talmud for Mikvaot 7:2

אֵלּוּ פוֹסְלִין וְלֹא מַעֲלִין, הַמַּיִם, בֵּין טְמֵאִים בֵּין טְהוֹרִים, וּמֵי כְבָשִׁים וּמֵי שְׁלָקוֹת, וְהַתֶּמֶד עַד שֶׁלֹּא הֶחֱמִיץ. כֵּיצַד פּוֹסְלִין וְלֹא מַעֲלִין. מִקְוֶה שֶׁיֶּשׁ בּוֹ אַרְבָּעִים סְאָה חָסֵר קֹרְטוֹב, וְנָפַל מֵהֶן קֹרְטוֹב לְתוֹכוֹ, לֹא הֶעֱלָהוּ, פּוֹסְלוֹ בִשְׁלשָׁה לֻגִּין. אֲבָל שְׁאָר הַמַּשְׁקִין, וּמֵי פֵרוֹת, וְהַצִּיר, וְהַמֻּרְיָס, וְהַתֶּמֶד מִשֶּׁהֶחֱמִיץ, פְּעָמִים מַעֲלִין וּפְעָמִים שֶׁאֵינָן מַעֲלִין. כֵּיצַד. מִקְוֶה שֶׁיֶּשׁ בּוֹ אַרְבָּעִים סְאָה חָסֵר אַחַת, נָפַל לְתוֹכוֹ סְאָה מֵהֶם, לֹא הֶעֱלָהוּ. הָיוּ בוֹ אַרְבָּעִים סְאָה, נָתַן סְאָה וְנָטַל סְאָה, הֲרֵי זֶה כָשֵׁר:

These invalidate and do not raise: [drawn] waters, whether pure or impure, and picking waters, and waters in which foods were boiled, and inferior wine [made by fermenting grape residue steeped in water] that has not yet fermented. How do they invalidate and not raise? If there is a mikveh containing forty se'ah less one kortov [A minute volume measure], and one kortov [of one] of these fell into it, it has not raised it [to be a full forty se'ah and thus a complete mikveh]; and three log of it [of any of these] would invalidate [such a mikveh]. But the remaining liquids [such as oils and wines], and fruit juices, and juices of salted fish, and fish brine, and inferior wine once it has fermented, [all of these] at times raise [a mikveh to be complete] and at times do not raise. How so? If there is a mikveh containing forty se'ah less one, and a se'ah [of one] of these fell into it, it has not raised it [to be complete]. If it contained forty se'ah [at the outset], and one added a se'ah [of one of these] and [then] took out a se'ah, it is thereby valid.

Jerusalem Talmud Terumot

It was stated: If the heave became a plurality it is as if he had added intentionally⁸⁹It cannot be lifted even in very large amount of profane produce, as stated in Mishnah 9. If so much heave can fall into profane food it shows that the negligence borders on intentional misconduct.. But did we not state⁹⁰Mishnah Miqwaot 7:2. The expression “he added” shows that a religious bath (miqweh) which contains the required amount (40 seah) of natural water, additional water may intentionally be added from vessels without impairing the validity of the bath.: “If it contained 40 seah, he added a seah and removed a seah, it is in order.” How far? Rebbi Assi in the name of Rebbi Mana bar Tanḥum⁹¹An Amora in Tyre between the second and third generation of Galilean authorities., Rebbi Abbahu in the name of Rebbi Joḥanan, up to the larger part of the miqweh⁹²In the Babli (Yebamot 82b), it is made clear that in a miqweh of exactly 40 seah, exactly 20 seah can be added and removed. This also seems to be the meaning here.. And here you say so? There it was a plurality, you add to it and it is in order. But here, every single seah needs 100 seah. Rebbi Yose said, this means that anything becoming insignificant by biblical law is activated by its own kind to become forbidden⁹³Since 40 seah in a miqweh permit the addition of water from a vessel, once the water enters the miqweh its quality as poured from a vessel becomes insignificant and it becomes like natural (spring or rain) water. But if the added and removed quantities become more than 20 seah, the miqweh becomes forbidden. This proves that the insignificance of the invalid water is conditional. The principle stated here is accepted in both Talmudim..

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