Preparation for the mikveh consists of two stages –
chafifah (washing) and
iyun (inspection). The requirements of
chafifah are met by washing all parts of the body and ensuring that the folds and crevices (e.g. between toes, under breasts) are washed in warm water. In addition, the hair has to be washed in warm water and thoroughly combed. Please refer to our article on
Preparation (Chafifah) for a more comprehensive description of the requirements of
chafifah.
Swimming alone does not discharge the obligation of
chafifah. It can, however (assuming one doesn't engage afterwards in activities that would make one dirty), assure that the body is sufficiently clean that the
chafifah process is much faster. It would, for example, be sufficient to take a warm shower prior to mikveh immersion so that warm water is brought to the places mentioned and the hair properly prepared.
Just prior to mikveh immersion the woman must inspect all parts of her body to assure that the Torah requirement of
iyun (inspection) is met.