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100% Brand New & High Quality Food Grade 304 Stainless Steel 0.5 Micron Diffusion Stone Features: 0.5 micron diffusion stone = high efficiency fermentation Improve the wort fermentation process tremendously Perfect for carbonation of Beer/ Soda/ Juice Easy to clean & Smaller Bubbles & Keep Clean 0.5 micron aeration stone are much more effervescent & frothy than soda guns Please Note: 1. To avoid getting clogged, don't use your bare hands touch the surface of aeration stone. 2. Before insert the oxygen stone into liquid, you must turn on the gas. 3. Clean diffusion stones thoroughly before and after use. 4. It is necessary to install an air filter to ensure the air clean. Package: 1 x Diffusion Stone 1 x 20" Silicon Hose