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The mishna in Yoma (30a) on our daf describes the five tevilot (immersions in a mikva) performed by the kohen gadol during the Yom Kippur avoda (beit ha-mikdash ceremonies). This represents a dramatic increase from the standard single immersion required for each kohen prior to the daily service in order to purify him and pave the way for his entering the mikdash.
Rashi explains the Mishna (the Jerusalem Talmud makes this point, as well) as referring not only to someone who entered the precincts of the Temple to perform avodah (service), but to anyone who had reason to enter the sanctuary, even if he was not planning to participate in the Temple service. Some explain that this is necessary only because a kohen who is found on the premises may be invited to participate in some aspect of the avodah, and therefore must be prepared to do so.
This leads us to an intriguing case of latter day attempts to make mikveh more appealing through the efforts of Rabbi David Miller, Even prior to his move to California, Rabbi Miller observed the abandonment of Jewish observances like Shabbos and taharas hamispachah and dedicated his life to reversing this calamity.
In the early twentieth century, Rabbi David Miller of Oakland, California dedicated himself “to the revival of the observance of niddah–tevilah–mikvah.”[He theorized that women were uncomfortable immersing in public mikvaot for reasons of hygiene or modesty. (This discomfort may have been the product of improved private bathing facilities.) His proposed solution was “a mikvah in every home.”
A successful contractor, he published reams of designs for mikvaot that (he certified) could be built cheaply and effectively by anyone and fit easily and attractively into living areas as well. They could even be disguised as cabinets or used as the frame for sofas, etc.