(Mishnah): One who immerses for Chulin, and he intended to eat Chulin, he is forbidden to [eat] Ma'aser.

One who immerses for Ma'aser, and he intended to eat Ma'aser, he is forbidden to [eat] Terumah;

One who immerses for Terumah, and he intended to eat Terumah, he is forbidden to [eat] Kodesh;

One who immerses for Kodesh, and he intended to eat Kodesh, he is forbidden to [engage in] Chatas.

One who immerses for something stringent, he is permitted to something lenient. One who immerses and did not intend, it is as if he did not immerse.

(Gemara) Question: Does Chulin need intent?!

Answer: [Our Mishnah] comes to teach a bigger Chidush. Even if one immerses for Chulin, and he intended to eat Chulin, he is forbidden to Ma'aser.

Question: Didn't R. Elazar teach that like the count of [levels of Tum'ah for] Chulin, so is the count of Ma'aser?!

Answer: Here (our Mishnah discusses) eating. Here (R. Elazar discusses) touching.

One who immerses Stam is permitted all of them.

(R. Yochanan): This is when he needed [to eat] all of them [and he intended for all of them, just he never said so.]

(Tosefta): When his feet are still submerged in the water, he may intend for any Taharah that he wants.

(Mishnah): If a staff is full of Tamei liquids, once he touched it to a Mikveh, it became Tahor (A liquid on an incline is considered connected. It is as if all the liquid touches the Mikveh). R. Yehoshua says so;

Chachamim say, [it is not Tahor] until he immerses all of it.

(Reish Lakish): They argue about a light (mid'Rabanan) Tum'ah, but a severe (mid'Oraisa) Tum'ah, even R. Yehoshua agrees.

(R. Yochanan): They argue even about a severe Tum'ah.

Question (against Reish Lakish - Tosefta): When his feet are still submerged in the water, he may intend for any Taharah that he wants.

Answer: He establishes it to discuss one who ate Tamei food or drank Tamei liquids (a light Tum'ah).

Question: R. Yakov bar Zavdi cited R. Avahu citing Reish Lakish to say that one who ate Tamei food or drank Tamei liquids, his body becomes Tahor without intent! (The Tosefta requires intent!)

Answer: (Reish Lakish discusses for Chulin.) Here (the Tosefta), since he intended for a greater Taharah, he needs intent.

Question (against Reish Lakish - Mishnah): If a Mikveh has exactly 40 Sa'im, and two people descended and immersed, both of them are Tahor. If they immersed one after the other, the first is Tahor and the second is Tamei (for some of the water is on the first, and less than 40 Sa'im remain).

R. Yehudah says, if the first's feet were touching the water [when the latter immersed], even the second is Tahor. (It is all considered connected. He did not specify. This implies even for a severe Tum'ah!)

Answer: Also this discusses one who ate Tamei food or drank Tamei liquids.

Question (against Reish Lakish - Mishnah): A radish in a cave - a Nidah may rinse it, and it is Tahor. (Attached water is not Machshir to receive Tum'ah.) If she raised it any amount from the water, it is Tamei;

It was taught about this that R. Yehudah is Metaher in the name of R. Yehoshua [because the water is still considered attached].

Is Nidah not a severe Tum'ah [and even so, he considers the water connected]?!

Conclusion: This argues with Reish Lakish. It cannot be resolved.