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There are many requirements given for a women's mikvah (See Yoreh De'ah siman 201), yet I have not seen much information regarding a men's mikva (to tovel every day before prayers or for Erev Yom Kippur).
What are its minimum requirements?
According to Berachos 22a-b, the minimum volume of water required to cleanse a Baal Keri is 9 kabs of water thrown on him, however it is preferable to use a Mikveh. In a Mikveh, full-body-immursion is required without being in contact with the walls. Eiruvin 4b says that the minimum volume for this is 1 ama x 1 ama x 3 amas high, or 40 seah.
R. Akiva and Juda Glostera add at the bottom of Berachos 22a that 9 kabs is just for someone who is both sick and has involuntary emissions. However Rashi says that Talmedi Chachamim are always a little sick, and can therefore use 9 kabs. Rav Dovid Grossman, in the iTalmud app shiur, says he saw a Shevet Halevi which says showering for a few minutes would be enough since the 9 kabs of water doesn't have to come from a Keili or have human force behind it.
Rav Grossman, says we hold like Takanas Ezera that in a Mikveh, a Baal Keri is cleansed even if his Mikveh is Keili and he has a Chatziza.
And CYLOR.
Men also immerse in a mikveh before Aliyah la-Regel thrice annually, to ascend the Temple Mount, or for kohanim to eat their terumah. The mikveh must not be pasul, and men who are immersing inside of it should worry about devarim she-chotzetzim. But ddaily tevilah as well as Yom ha-Kippurim tevilah is just as important as these other ones.
