Method for producing a beverage by dissolution of soluble beverage powder with water in a beverage preparation apparatus, - said apparatus comprising at least one chamber for receiving and mixing a dose of soluble beverage powder with water, said chamber comprising: ▪ an opened top to receive the dose of soluble beverage powder, and ▪ a lateral side wall said lateral side wall comprising a water inlet, and ▪ a bottom wall, said bottom wall comprising a beverage outlet conduit, and wherein the water inlet and the internal shape of the chamber are configured so that water introduced through the water inlet is able to form a swirl inside the chamber, and wherein the bottom wall presents the shape of a funnel inclined in direction of the beverage outlet conduit, and wherein said beverage outlet conduit presents a hydraulic diameter of at least 5 mm, and wherein said funnel is inclined by an angle of at least 30° with horizontal, and, - said method comprising the steps of: a) - introducing water through the water inlet to wet the internal surface of the funnel of the bottom wall, then b) - stopping the introduction of water, then c) - introducing a dose of soluble beverage powder in the chamber, then d) - introducing water in the chamber to dissolve the powder. - said apparatus comprising at least one chamber for receiving and mixing a dose of soluble beverage powder with water, said chamber comprising: ▪ an opened top to receive the dose of soluble beverage powder, and ▪ a lateral side wall said lateral side wall comprising a water inlet, and ▪ a bottom wall, said bottom wall comprising a beverage outlet conduit, and wherein the water inlet and the internal shape of the chamber are configured so that water introduced through the water inlet is able to form a swirl inside the chamber, and wherein the bottom wall presents the shape of a funnel inclined in direction of the beverage outlet conduit, and wherein said beverage outlet conduit presents a hydraulic diameter of at least 5 mm, and wherein said funnel is inclined by an angle of at least 30° with horizontal, and, ▪ an opened top to receive the dose of soluble beverage powder, and ▪ a lateral side wall said lateral side wall comprising a water inlet, and ▪ a bottom wall, said bottom wall comprising a beverage outlet conduit, and wherein the water inlet and the internal shape of the chamber are configured so that water introduced through the water inlet is able to form a swirl inside the chamber, and wherein the bottom wall presents the shape of a funnel inclined in direction of the beverage outlet conduit, and wherein said beverage outlet conduit presents a hydraulic diameter of at least 5 mm, and wherein said funnel is inclined by an angle of at least 30° with horizontal, and, - said method comprising the steps of: a) - introducing water through the water inlet to wet the internal surface of the funnel of the bottom wall, then b) - stopping the introduction of water, then c) - introducing a dose of soluble beverage powder in the chamber, then d) - introducing water in the chamber to dissolve the powder. a) - introducing water through the water inlet to wet the internal surface of the funnel of the bottom wall, then b) - stopping the introduction of water, then c) - introducing a dose of soluble beverage powder in the chamber, then d) - introducing water in the chamber to dissolve the powder.