מקואות ו׳:ח׳ - ו׳:ט׳

העליון מן התחתון – as for example, that the upper [Mikveh] had drawn water and the bottom [Mikveh] had kosher/fit water.

והרחוק מן הקרוב – but we ae not concerned lest a person come and he stopped/interrupted the contact between liquids [so that the water of the ritual bath comes in contact with the impure water], and has immersion did not have any effect for him.

מביא סילון של חרס או של אבר (brings a pipe of earthenware or lead) – and the same law applies of wood or of bone or of glass. אבר – lead.

ומניח ידו תחתיו – of the pipe in order that the water does not go outside when he fills it until the time when the waters come in contact and combine with the other [pure] Mikveh.

אפילו כשערה – and they (i.e., the Rabbis) were lenient regarding drawn water which is Rabbinical. But if the upper [Mikveh] was lacking from its measure and he comes to make it fit through contact with the waters [of the lower Mikveh] to complete it to its appropriate measure, it is not enough with contact as much as a hair’s breadth, for even Rabbi Yehuda who is more lenient in the second chapter of [Tractate] Gittin [16a] as he requires moist enough to moisten other objects.

ממלא בכתף – that since after there are forty Seah of fit/kosher water in the Mikveh, even all of the drawn water in the world does not invalidate it.

לשתי – from above to below.

לערב – from right to left.

חלוף הדברים – from above to below, it doesn’t combine, from right to left, it does combine. But the Halakha is not according to Rabbi Yehuda.

נפרצו זה בתוך זה – that is from above at the top of the wall. And specifically when the wall is split/chipped off or perforated but above at its top it is whole, is where we require like the mouth-piece of the leather bottle, but when the wall is broken through at its top and the waters combine there, it is sufficient like the thickness of a garlic peel or like the width of the mouth-piece of a leather bottle.