A potter’s lump [of clay] is qualified. R’ Yose disqualifies [it].  [Regarding] a chicken’s egg, R’ Meir and R’ Yehudah rule it qualified, but the Sages disqualify [it].

[Regarding] a trough [carved] in a rock, we cannot draw [water for mei chatas] from it nor consecrate [mei chatas] in it nor sprinkle [mei chatas] from it and it does not require a sealed cover and it does not disqualify a mikveh. [If] it was a vessel and one attached it [to the ground] with plaster, one may draw [water for mei chatas] from it and consecrate [mei chatas] in it and sprinkle [mei chatas] from it and it requires a sealed cover and it disqualifies a mikveh.  [If] the bottom [of the trough] was perforated and he plugged [the perforation] with a rag, the water inside [the trough] is invalid, because it is not encircled [by] a vessel. [If one perforated the vessel] in its side and plugged [the perforation] with a rag, the water inside it is valid, since it is encircled [by] a vessel.  [If] one made a rim of clay [for the trough] and the water went there, it is invalid. [If the rim] is strong enough that it can be carried with [the trough], [the water] is valid.

[Regarding] two troughs in one boulder, [if] one consecrated [mei chatas in] one of [the troughs], the water in the second [trough] is not consecrated.  [If the troughs] were perforated from one to the other [with a hole] the size of a skin bottle’s tube, or if water was flowing over them even if [only a flow as thin] as a garlic peel, and one consecrated [mei chatas in] one of them, the water in the second [trough] is consecrated.

[Regarding] two rocks that one positioned near each other and made into a trough, and similarly [regarding] two kneading bowls, and similarly [regarding] a trough that split [in two], the water between them is not consecrated. [If] he connected them with lime or gypsum so they can be carried as one, the water between them is consecrated.