Quoting%20commentary for Mikvaot 1:5

מֵאֵימָתַי טָהֳרָתָן. בֵּית שַׁמַּאי אוֹמְרִים, מִשֶּׁיִּרְבּוּ וְיִשְׁטֹפוּ. וּבֵית הִלֵּל אוֹמְרִים, רַבּוּ אַף עַל פִּי שֶׁלֹּא שָׁטְפוּ. רַבִּי שִׁמְעוֹן אוֹמֵר, שָׁטְפוּ אַף עַל פִּי שֶׁלֹּא רַבּוּ. כְּשֵׁרִין לַחַלָּה וְלִטֹּל מֵהֶן לַיָּדָיִם:

When does their purity [that of the waters of shallow pools during the rain] begin? Beit Shamai say: from when they [the rain waters] exceed [the amount of the pools' waters] and cause overflow. Beit Hillel say: [from when] they exceed, even if they do not cause overflow. Rabbi Shimon says: [from when] they cause overflow, even if they do not exceed. [Such waters are] valid to be used for <i>challah</i> [a portion of a batch of bread dough given to a priest which becomes holy upon separation, and can only be consumed by priests or their household], as well as for washing [literally: taking] one's hands with them.

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