A method for treating a fluid to increase oxygen content while reducing surface tension. The first step is flowing a fluid into a surface tension modification device at a first pressure and applying a frequency from about 0.05 Hz to about 5000 Hz into the fluid to modify a physical characteristic of the fluid forming an altered fluid. The next step is flowing oxygen or ozone into the altered fluid forming an altered fluid mixture. After the altered fluid mixture is formed, then flow the altered fluid mixture into the inner chamber of a multichamber device at a second pressure which is lower than the first pressure. The last step is passing the altered fluid mixture from the inner chamber through a plurality of funnels forming a turbid fluid condition at a focus point in an outside chamber to dissolve nano-sized oxygen particles into the fluid at an increased concentration.