Reference for Mikvaot 6:4

הַסְּפוֹג וְהַדְּלִי שֶׁהָיוּ בָהֶן שְׁלשָׁה לֻגִּין מַיִם וְנָפְלוּ לַמִּקְוֶה, לֹא פְסָלוּהוּ, שֶׁלֹּא אָמְרוּ אֶלָּא שְׁלשָׁה לֻגִּין שֶׁנָּפְלוּ:

Regarding a sponge or a bucket which had inside them three <i>log</i> [a specific unit of liquid measurement] of [drawn] water, if they fell into a <i>mikvah</i> [which does not contain forty <i>se'ah</i> of valid water], they do not render it invalid, for they [the Sages] only said "three <i>log</i> that fell" [into a incomplete <i>mikveh</i> invalidate it; but in these cases, not all of the three log of water actually ever fell into the <i>mikveh</i>, since some remain inside the sponge or bucket].

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