D. Baal Keri-Mikveh:[1]

It is permitted for a Bal Keri[2] to wear Tefillin after cleaning[3] the semen off from his body. However, so long as he still has semen on his [body or outer clothing[4]] it is forbidden to wear Tefillin. [It is not obligatory for one to immerse in a Mikveh before wearing the Tefillin.[5] Nonetheless, some meticulous individuals would wash their lower halves of the body in the morning prior to Davening.[6] Furthermore, it is customary of Chassidim to immerse in a Mikveh prior to saying blessings, Davening, or performing Mitzvos, if one is a Bal Keri, and hence certainly a Baal Keri is to immerse prior to wearing Tefillin.[7] However, if there is no Mikveh available, then certainly one should not nullify the Mitzvah of Tefillin due to this. In such a case, one can simply take a shower in place of going to Mikveh, prior to wearing the Tefillin.[8]]

[1] Admur 40:9; Rama 40:6; Or Zarua 1:594; Ateres Zekeinim 40:3; See also Admur 76:4 and 88:1

[2] Definition: One who has released semen either in marital intercourse or through nocturnal emission, or heaven forefend even due to Zera Levatala

[3] See Admur 76:4 that if the semen is wet it suffices to clean it with a dry cloth, while if it has dried, then it must be washed off.

[4] See Admur 76:4 regarding Davening that a) It is proper to be stringent by semen just as by feces, and hence one is not to Daven if the semen is on his skin, until it is washed off, even if it is covered by clothing. 2) If it is not on the skin but on one’s clothing, then if it is on one of the inner clothing that is covered by exterior clothing, then it does not prohibit Davening. However, if it is on the outer clothing, then it must be cleaned/washed off. 3) Some Chassidim were stringent not to have semen even on their inner clothing.

[5] Poskim ibid; Ateres Zekeinim 40:3 “He may wear them even though he is considered impure”

[6] Sefer Chassidim 509

[7] See Piskeiy Teshuvos 88:1-2; 240:30

[8] Admur 88:1; 606:11; Taz 88:1; Olas Tamid 88:2; M”A 606:9; Elya Raba 606:11; Mishneh Mikvaos 3:4; See our corresponding Sefer “The laws and custom of Rosh Hashanah” or “Yom Kippur” under the laws of immersion for the full details of this matter.