Method and device for producing a liquid which contains a high concentration of very small bubbles

A method for producing a liquid containing a high concentration of tiny bubbles, comprising the following steps:

• a) providing a liquid in a first closed reservoir,
• b) feeding the liquid under pressure from the first reservoir into a nanobubble generator and further into a second reservoir, such that smallest bubbles are generated in the liquid as it flows through the nanobubble generator,
• c) passing the liquid from the second reservoir into the first reservoir, and
• d) repeating steps b) and c) as often as necessary to achieve a predetermined concentration of the smallest bubbles in the liquid, wherein the force for moving the liquid is provided not being provided by a thrust force imparted by another fluid or a thrust element.