Abstract: An aerated bath is disclosed which allows an effervescent effect to be provided. A liquid flow (56) including a significant volume of entrained air bubbles (10) is ejected into the bath such that the flow follows the base (54) of the bath under the influence of the Coanda effect. Once the transport velocity of the liquid flow is too low for continued entrainment of the bubbles they rise to the surface to provide the effervescent effect.