05 Micron/2 Micron Diffusion Stone Stainless Steel Oxygenation Aeration Stone for Home Brewing Beer Quickly Carbonated Aquarium Homebrew Talk with "5 or 2 Micron Diffusion Stone" Usually the 0.5 micron stone is used for co2 and pure O2 which could get smaller more intensive gas molecules,this helps the beer to better complete the carbonization process.. And the 2 micron stone is best for working with aquarium pumps. While providing sufficient gas, it is less likely to clog and has a longer service life than 0.5 micron aerated stone.. 0.5 Micron/2 Micron Diffusion Stone, Stainless Steel Oxygenation Aeration Stone for Home Brewing Beer Quickly Carbonated,Use for Aquarium,DIY Sparkling Water Specification: Name: Diffusion Stone Material: 304 Stainless Steel Barb Diameter: 1/4'' Barb Description: 0.5 micron diffusion stone for high efficiency fermentation, Beer Forced Carbonation 2 micron diffusion stone provide more enough bubbles for Aquarium at the same time and Not easy to cause congestion. Diffusion Stone is widely use for carbonation of Beer, Soda, Juice, DIY Sparkling Water and working in Aquarium... Easy to clean by boil it (Please wear gloves when touching this diffusion stone) Please Note: Soak the diffusion stone in clean water for 10-15 minutes before use It is necessary to install an air filter to ensure the air goes through is clean. To avoid getting clogged, don't use your bare hands to touch the surface of aeration stone. _x000D_