The Mikve is the ritual bath of purification in the Jewish
religion. It is possible diving in fresh spring water, or in a place
specially dedicated to it, fed by rainwater that must be collected, stored and
communicated to the vessel that is called a Mikve. All this must be made
under a very strict set of rules related to the degree of purity of
water. These rules also include the use of materials, architectural
measures and water treatment.