Mishnayos Mikvaos Perek 8 Mishnah 1

ארץ ישראל טהורה – and even the villages of the Cutheans (i.e., Samaritans) upon whom they (i.e., the Rabbis) did not decree [ritual] impurity, other than the lands of the nations outside of the Land [of Israel].

ומקואותיה טהוהים – and we don’t presume them to be of drawn [water], for undefined they were made kosher/fit.

לבעלי קריין – to permit them by the words of the Torah, for a person who experienced a seminal emission is prohibited by the words of the Torah until he [ritually] immerses, and if he [ritually] immerses in a place where all of its waters are drawn, it is permitted.

אפילו נתמלאו בקילון (even if they were filled up with a swipe and bucket for drawing water – see also Tractate Moed Katan, Chapter 1, Mishnah 1) – that they filled water with a shoulder and poured it into a hole and from that hole/indentation there is a path that the water travels to the Mikveh.

שחוץ למפתח – outside of the opening of the town gate.

כשרים אף לנדות – to permit them to their husbands, and even though there is the prohibition of extirpation [for not following the laws of the menstruant woman properly]. But we are not concerned lest they (i.e., the Mikvaot/ritual baths) were lacking [enough water] and that drawn water fell upon them and they were filled up, for outside of the town gate, the foot of people are not found there.

לפנים מן הפחת – inside from the entrance to the town gate.

ופסולים לכל הטמאים – for many people are found there and fill up water with their shoulders and give them there [clothing] to launder and to wash.

מפני הכביסה – that one can say that they (i.e., the Mikvaot/ritual baths) were lacking [in water] and were made invalid from the utensils that they would launder there.

הרחוקים טהורים – for they don’t launder in them but one shouldn’t be concerned for this. But the Halakha is not according to Rabbi Eliezer.