A mikvah is a pool of water supplied by a natural source such as a river or lake. It is used for Jewish purification ceremonies. The mikvah is used for various rituals: conversion, marriage, or after menstruation (among Orthodox and Masorti Jews). Some men in the Hasidic community immerse themselves in the mikvah on a weekly or even daily basis. The mikvah is also used to purify newly acquired items. The persons entering the mikvah must immerse themselves completely, their hair must be untied, and they are not allowed to wear any jewellery, clothing, or even bandages. Every part of the body should be in contact. with the water.