Rabbi Yose says: Two mikvaot [gatherings of water collected by natural means and immersed in for purification] that do not [each] contain forty se'ah [a specific measure of volume], and which a log [a specific measure of volume] and a half [of drawn waters] fell into this one, and a log and half into that one, and they [the two mikvaot] became mixed together, they are valid, since they were never given a title of invalidity [i.e. independently, each was considered valid by the law]. But a mikveh which does not contain forty se'ah, into which fell three log [of drawn waters], and was then split into two, it is invalid, since it was given a title of invalidity [since three log of drawn waters invalidate a mikveh containing fewer than forty se'ah of valid waters]. And Rabbi Yehoshua considers it valid, for Rabbi Yehoshua would say: Any mikveh which does not contain forty se'ah [of valid waters], if three log [of drawn waters] fell into it, and it [then] became lacking even a kortov [A minute volume measure], it is valid [when enough valid water is added], since it is lacking [part of the] three log. And the Sages say: it is forever in its invalid state, until its fullness plus some more depart from it [i.e. it would need to become lacking the amount of water it contained before the drawn waters were added, plus a little more, in order to be considered valid].

How so? If there is a pit in the courtyard, and three log [of drawn waters] fell into it, it is forever in its invalid state until its fullness, plus some more, depart from it, or until one erects [another mikveh containing] forty se'ah in the courtyard [and makes an opening to connect between them], and the upper [waters] will be purified by the lower. Rabbi Elazar ben Azariah considers it invalid, except if one plugs up [all the sides of the pit containing the invalid waters, such that it is open only to the valid mikveh].

If there is a pit full of drawn waters, and a channel [of rainwater] is entering into to and leaving from it, it is forever in its invalid state until it is calculated that there no longer remain [in the pit] three log [or more, of drawn waters] from the original amount. Two individuals who were dropping, this one a log and a half and that one a log and a half, into a mikveh; or one who wrings out his clothing and it drops [water into the mikveh] from many areas [of the clothing]; or one who pours out [water] from a tzirtzur [a stone vessel with a netted opening] and it drops from many areas [of the vessel]; Rabbi Akiva considers these [such cases] valid, and the Sages consider them invalid. Rabbi Akiva said, "They did not say 'if they drop [three log of drawn waters, it is rendered invalid],' but rather 'if it drops.' [implying that it is only invalid if the water was dropped in from only one source]" They said to him, "They said neither this nor that. Rather [they said,] 'one that three log fell into it [is rendered invalid, and there is no distinction between dropping from one or multiple sources].'"

If [three log of drawn waters fell into a mikveh] from one vessel, from two, or from three, they join together [to add up to the required measure to render the mikveh invalid]; but from four [vessels], they do not join together. A ba'al keri [a male who has had a seminal emission but has yet to purify himself by immersion in a mikveh] who is ill, if nine kav [a specific volume measurement, equal to four log] fell on him [which the Sages established to be sufficient to purify him in such a case when he is ill and therefore cannot immerse], or a pure individual who three log of drawn waters fell on his head and the majority of his body [which the Sages established renders one impure], if [they fell on him] from one vessel, or from two, or from three, they join together [to add up to the minimum measure required to render them either pure or impure, respectively]; if from four, they do not join together [to add up to the required measure to have an effect]. Regarding what were these words said? Regarding a time when the second [vessel] began [pouring] before the first had stopped. And regarding what were these words said [i.e. that three log poured from four vessels, or not poured in close succession, do not join together to render a mikveh invalid]? Regarding a time when one did not intend to increase [the waters of the mikveh]; but if one did intended to increase, even [only by] a kortov every year, they do join together to three log [rendering the mikveh invalid].