Usage Tips:[Healthy safe]: The Whole 0.5 Micrometre diffusion stone is made of Stainless Steel, which let our 0.5 Micrometre aeration stone anti-corrosion & high temperature resistant & Durable. [Unique Carbonated Flavour]: 0.5 Micrometre diffusion stone produces smaller & finer bubbles which can make the gas combines with liquid faster. Make draft beer, home brew soda and other drinks more delicate, more exquisite and more fresh. [Various Use]: 0.5 Micrometre aeration stone is best for oxygenation & carbonation. Use this air stone to oxygenate wort and carbonate beer/ soda prior to fermentation. Works great for other drinks as well [Connect With Fittings]: Attaching the aeration stone barb to a 1/4inch ID hose, and the other side of the hose can be attached with the "gas in" post on a keg and then connect the keg with CO2 regulator. [Boiled Clean]: The 0.5 Micrometre diffusion stone needs to be boiled in water to get clean & unclog the pores. Sometimes if the aeration stone get blocked, can be dipped in acid for 15 seconds and then rinse with water. colour: silver Material: stainless steel Package Contents: 1 x Defoaming stone 1 x hose (50cm) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.