Catechism of the Catholic Church §1238 — excerpt
The baptismal water is consecrated by a prayer of epiclesis (either at this moment or at the Easter Vigil). the Church asks God that through his Son the power of the Holy Spirit may be sent upon the water, so that those who will be…
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.