Diffusion Stone

The Safilter Diffusion Stone, also known as a carbonation or carb stone, is integral for carbonating beers and introducing gas into beverages. Its distinct porous design facilitates the efficient release and infusion of gas into liquids, enhancing the brewing process.

The diffuser stone is mainly made of sanitary stainless steel, the standard material is SS 316L, and special titanium alloy variants are also available. Its sintered metal powder medium ensures strong mechanical properties, making it resistant to temperature fluctuations and corrosion.

Exceptionally suited for challenging environments, this diffuser stone remains durable in both extreme temperatures and corrosive settings. We ensure quality by certifying each raw material batch, with certifications like EN10201 3.1/3.2 available upon request.



  • Micron Rating: 0.1- 60μm 
  • Porosity: 15-45 %
  • Standard Diameters: 0.5”, 1”, 2”
  • Length: 5” to 40”
  • Connection: tri-clamp, BSP/NPT thread, straight tube, flange, and sanitary connections, barb
  • Body Material: 316L stainless steel (standard), Nickel 200, Monel® 400, Inconel® 600, Hastelloy® C-22/C-276/X and Alloy 20.
  • Operating Temp: temperatures as high as 1450℉(787℃)under oxidizing conditions. 
  • Pressure: <45 Mpa


  • The bubbles are tiny and uniform, with a high dissolution efficiency.
  • Hygienic design and production according to hygienic standards.
  • Stainless steel is compatible with most liquids.
  • The bubble size can be precisely controlled.
  • Customized connection design according to the application, easy to install and remove.
  • It can work under high pressure or high temperature.
  • Made by sintering process, no powder falling off the surface.
  • Repeated cleaning by high-temperature steam or chemical soaking.



  • Biological Remediation: Air sparging stimulates bacterial growth to help degrade contaminants.
  • Carbonation: CO2 sparging is used in the production of carbonated beverages and beer.
  • Chlorine Bleaching: Chlorine sparging is used in the pulp and paper industry to bleach pulp.
  • Column Flotation: Air sparging is used in solid separation processes, such as coal flotation, where bubbles attach to solid particles, facilitating their removal.
  • Dewatering: Nitrogen sparging is used to remove entrained water from machine oil.
  • Fermentation: Oxygen or air sparging promotes cell growth during the fermentation process.
  • Gas/Liquid Reactions: Injecting air or oxygen into the reactor improves the performance of chemical reactions.
  • Hydrogenation: Hydrogen sparging is used in various chemical hydrogenation reactions.
  • Oil Flotation: Air or natural gas sparging is applied to separate oil from produced water in oil well operations.
  • Oxygen Stripping: Nitrogen sparging removes oxygen from substances like edible oil, wine, and juice to prevent oxidation.
  • Oxygenation: Oxygen spraying in fish farming significantly promotes fish growth.
  • Ozonation: Ozone sparging is used for disinfection in ultra-pure water systems in pharmaceutical plants.
  • PH Control: CO2 or NH3 injection can adjust the pH value of wastewater or process fluids.
  • Steam Injection: Direct steam injection achieves efficient heating and eliminates the "steam hammer."
  • Volatile Stripping: Air sparging removes volatile organic compounds (VOCs) from waste liquids, contributing to environmental protection and pollution control.

Areation/Oxygen Stone

An Areation/Oxygen Stone is a porous element made primarily of stainless steel (link) designed to inject oxygen or air into the wort during fermentation. Its tiny pores create fine air bubbles, ensuring uniform dissolved oxygen for improved fermentation results

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Micro bubble air stone  

The Micro Bubble Air Stone is a device designed to produce fine, minute air bubbles in water, enhancing oxygen diffusion and improving water quality. Commonly used in aquariums and hydroponic systems, it facilitates better gas exchange and promotes healthier aquatic life.

OEM Size

Diffusion Stone is designed, manufactured, and finished in Saifilter. If you need non-standard sizes or special accessories, Saifilter can meet your application requirements. The Diffusion Stone usually consists of a porous metal element and a connecting joint.

The connector type depends on your application. Simple installation, no special tools required. From single components to manifold systems, Saifilter Diffusion Stone is one of your most efficient gas/liquid contact solutions.


Porous diffusion stone in fermenter 

The porous diffusion stone in the fermentation tank is a microporous element usually made of sintered stainless steel powder, which can evenly disperse gases such as oxygen or carbon dioxide into the fermentation liquid through pores. Its use enhances yeast health and fermentation efficiency by ensuring consistent gas distribution.


Stainless steel diffusion stone

A stainless steel diffusion stone is a specialized tool crafted from antibacterial stainless steel, featuring tiny pores to disperse gases evenly into liquids. Due to its minute pores, it's essential to handle and clean it properly to prevent clogging and ensure efficient gas diffusion.


Porous diffusion stone in fermenter 


Porous diffusion stone in fermenter 


After a period of use, the Diffusion Stone is clogged and requires steam and compressed air for cleaning.


The stainless diffusion stone (threaded+barb connection) has a simple design and no moving parts.


Stainless steel ozone diffuser stone

The Stainless Steel Ozone Diffusion Stone is an economical gas diffusion element designed to efficiently disperse oxygen into water or other media. Made from standard sanitary stainless steel with antibacterial properties and microscopic pores to ensure the creation of small and consistent ozone bubbles.


System integration stainless steel diffusion stone


System-integrated stainless steel diffusion stones are integrated into the vessel by design and are designed for effective gas diffusion in a variety of applications. Made from stainless steel or other alloys, this diffusion stone is durable and resistant to bacterial growth, ensuring optimal performance and longevity.

Caring for Your Diffusion Stone

Diffusion stones, typically crafted from stainless steel, serve as an antibacterial medium due to their material properties. However, the minute pores on these stones can easily become clogged, especially if mishandled. To ensure longevity and efficiency:

  • Cleaning Recommendations:
  1. Boiling Method: Place the stone in clean water and boil for 2-5 minutes. Afterward, let it air dry naturally or give it a clean air flush. 
  2. Chemical Cleaning: For stones that have been unused for long periods or those that are heavily clogged, immerse them in an acid or another appropriate chemical solution. This process facilitates a chemical reaction with the obstructing particles, effectively unclogging the stone.
  3. Ultrasonic Cleaning: After the initial flush, you can detach the stone from its assembly. Place it inside an ultrasonic cleaner, where it will be cleaned by sound waves. This technique is particularly adept at thoroughly cleaning the micropores, reaching depths that conventional cleaning might miss.

Always ensure that you handle the diffusion stone either with sanitized gloves or by holding its barbed end. This prevents oils from your fingers from blocking the pores. Moreover, before and after each use,  comprehensive cleaning of your diffusion stone is crucial to ensure its extended lifespan.

  • Sanitizing Your Stone:
  1. Boiling: For effective sanitization, boil the stone for 1-3 minutes. This helps to break down any internal residues and exterminate any bacteria. For optimal results, run air through the stone in the last boiling minute to expel broken-down contaminants.
  2. Alternative Sanitization: If boiling isn't feasible, consider soaking the stone in Star San. This solution removes a significant portion of surface contaminants. However, it may not sanitize the stone's interior, which might still harbor contaminants. To enhance the sanitization process, push air through the stone while it's immersed in the solution for about 5 minutes.

Handling Precautions: Avoid direct contact with the sintered section of the stone, as the natural oils on our fingers can block its pores. Instead, hold the stone by its barb, or any connected tubing, or place it in protective packaging to create a barrier between your fingers and the stone.

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A diffusion stone, also known as an aeration stone or oxygen stone, is a device commonly used in home brewing and aquarium setups. It is made of porous material, typically stainless steel or sintered stone, which helps to diffuse gases, such as oxygen or carbon dioxide, evenly into liquids. In brewing, it is often used to oxygenate wort before fermentation, whereas in aquariums, it aids in providing an adequate oxygen supply for aquatic life.

A diffusion stone works by being connected to a gas source, like an oxygen tank or air pump. As the gas flows through the stone, it gets dispersed through the numerous tiny pores present on the stone's surface, breaking the gas into fine bubbles that dissolve easily and evenly into the liquid. This process promotes better gas-liquid interaction, ensuring a homogeneous mixture and optimal conditions for fermentation or aquatic environments.

Cleaning and maintaining a diffusion stone is vital to ensure its longevity and effectiveness. It is usually recommended to clean the stone after each use to prevent clogging and buildup of materials. You can clean it by soaking it in a sanitizing solution or hot water for several minutes. Using brushes with soft bristles to gently scrub the pores can also be effective. After cleaning, make sure to dry it properly to prevent bacterial growth.

It's generally not recommended to use the same diffusion stone for different purposes interchangeably due to the potential cross-contamination and different requirements of gas dispersion in brewing and aquarium setups. It would be best to have separate stones dedicated for each application to maintain the purity and safety of both environments.

When choosing a diffusion stone, you should consider several factors including:

  • Material: Choose a stone made of materials like stainless steel or sintered stone which are durable and resistant to corrosion.

  • Pore Size: Depending on the application, you might need a stone with finer or coarser pores. Finer pores produce smaller bubbles, which are ideal for a more homogeneous gas distribution.

  • Compatibility: Ensure that the stone is compatible with your existing equipment, such as hoses and air pumps.

  • Ease of Cleaning: Opt for a stone that can be easily cleaned and maintained to prevent clogs and ensure a longer lifespan.

  • Brand and Reviews: Consider buying from a reputable brand and check reviews to gauge the performance and reliability of the stone.


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