1. Made of food-grade stainless steel, which makes the 0.5 Micrometre aeration stone anti-corrosion and high temperature resistant, durable with a long service life. 2. 0.5 Micrometre aeration stones are more effervescent and frothy than soda guns, producing smaller bubbles with even diffusion, no blockage, strong corrosion resistance, and can improve the wort fermentation process. 3. Must turn on the gas first, then insert the oxygen stone into the liquid. Attach the aeration stone barb to a 1/4 inch ID hose, and the other side of the hose can be attached to the "in" or "gas side" post or connected to the CO2 regulator. The beer stone works at lower pressures (about 3-5PSI). 4. Compared with 2 Micrometre, 0.5 Micrometre diffusion stone produces smaller and finer bubbles which help O2 or CO2 combine with liquid. It can make draft beer, soda, coffee and other drinks more delicate, exquisite and fresh. 5. Suitable for force carbonating kegged beer, use as an aeration stone prior to fermentation, carbonation of Beer, Soda or Juice, and works well for Cold Brew Coffee.