The Importance of Replacing Gas Adsorbent Media

Dry scrubbers and other types of gas-phase filtration equipment rely on chemisorbant media to clean environmental air of odorous gases and vapors. Different types of gas-adsorbent media are used in filtration systems, depending on the specific issue that needs to be addressed.

What is Gas Adsorbent Media?

Gas adsorbent media is usually produced in the form of porous pellets. Molecules of specific gases attach to the large surface area of the porous material and are filtered from the air. An even more advanced type of media, a chemisorbent, is an adsorbent media impregnated by a specific chemical which lines the surface area of these pores. The gas molecules come into contact with the impregnate, and a chemical reaction occurs which binds them into the pores of that media.

Medias are formulated to target gases such as:

  • Ammonia
  • Hydrogen Sulfide
  • Sulfur Dioxide
  • Nitric Oxide
  • Formaldehyde
  • Chlorine

Sodium or potassium permanganate is a common impregnant for activated alumina. It is an oxidizer which allows it to react with many of these often problematic gases. Media can reach the greatest possible capacity by use of the right formulation of porous materials and impregnate.

Gas Absorbent Media Replacement

There is a limit to the lifespan and adsorption capacity of all media. When it has been determined that the media is spent and due for changeout, it should be removed, properly disposed of, and new media should be installed.

Replacement of media is something the equipment owner can do, or it can be done by an experienced professional. Safe removal and disposal of spent media requires the use of gloves, protective goggles, and a dust mask to prevent inhalation.

Media Replacement and Regular Maintenance

Keeping equipment serviced with high-performance adsorbent media is an essential part of system maintenance. Failure to replace spent media with fresh media will result in poor equipment performance and unwanted gases being released into the environment. Gas adsorbent media typically lasts around a year, but factors such as airflow, type of gas, and the amount of gas in the environment will determine how the media actually performs. Depending on the type of equipment, there are multiple ways to test media to find out if it is nearing its expiration date.

Emergency gas scrubbers are a special type of system which is on standby for use in the event of an accidental release of chlorine or another toxic gas. Hopefully, the media in these systems don’t need to be replaced for a very long time, but PureAir can assist if a leak has occurred. In fact, after any suspected leak, it is incredibly important to get your adsorbent media tested and replaced. Otherwise, you may not be prepared in the event of the next emergency release.

PureAir Filtration Chemisorbant Adsorbent Media

PureAir’s chemisorbant media targets the removal of gases, vapors, and odors in industrial, municipal, and commercial industries. PureAir offers multiple types of media, often in the form of activated alumina and carbon, that are impregnated with potassium permanganate and other chemical binders.

PureAir has developed the right manufacturing process and formulation of porous base material and impregnate to achieve the greatest possible capacity for each type of gas that needs to be filtered. All our media is manufactured on site and can be incorporated into various housings/filters to meet specific media replacement needs in our equipment and competitor’s equipment.

Contact us to discuss your needs!


PureAir Filtration is the world leader in the removal of gases, toxic vapors, and odors. Visit this page for the latest company news as well as articles on our favorite topics!

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