Fine Bubbles Fine bubbles are bubbles with a diameter of 0.1 (=1μm) or more. Among fine bubbles, bubbles with a diameter of less than 0.001 are called ultra-fine bubbles. Avanti One supports your daily shower time with fine bubbles. Save 49,000 yen per year! Sebum removal up by about 77% Water saving rate 53% Opened for photography, unused.