Daily immersion in a mikveh

Q: Is it a daily obligation to immerse in a mikveh before davening?
A: There is no obligation. Ezra decreed that there is an obligation to immerse if one has a seminal emission, but as is known, our Sages ruled that we do not follow this as is written in the Shulchan Aruch, Orach Chaim 88. In our time, it is a stringency if one wants to do so and it is a double stringency for one who is pure and wants to do so. A person is not obligated to immerse before davening and not on Shabbat, but there is an established custom to do so on Erev Yom Kippur (Shulchan Aruch, Orach Chaim 606:4). Chasidim do have the daily custom to immerse since they say: sadness is not a transgression but it is the worst thing and immersion is not a mitzvah but it is the best thing. "Mitnagdim" (non-Chasidim Jews) do not have the custom to immerse on a daily basis. One important "Mitnaged" Rabbi was asked: why don't you immerse? He answered: I immerse in the waters of knowledge. I immerse in the Torah which is a purifying fire. In sum: there is no obligation to immerse. If a person sees that immersion increases his holiness and awe of Heaven, he should immerse. If someone sees Torah or something else increases his holiness and awe of Heaven, then each person should follow his own path.