Indoor plants typically need more attention than outdoor plants. For example, indoor plants need more maintenance and supplements like fertilizers, pesticides, and manure. Each of these components has a distinguished odor. If all of these odors are mixed up with each other, there is a possibility that an unpleasant odor may linger inside and even outside your grow tent. So, what should we do to eliminate this unpleasant odor? Well, it is recommended to use the best carbon filter for your grow room.






4-inch Carbon Filter with Australia Virgin Charcoal by iPower

4-inch Carbon Filter with Australia Virgin Charcoal by iPower

Editor’s Choice


Air Carbon Filter with Australia Virgin Charcoal for Inline Fan by VIVOSUN

​​Air Carbon Filter with Australia Virgin Charcoal for Inline Fan by VIVOSUN​​​


6-inch Odor Control Carbon Filter with Australia Virgin Coconut Activated Charcoal for Indoor Plants

​​6-inch Odor Control Carbon Filter with Australia Virgin Coconut Activated Charcoal for Indoor Plants​​​

Activated carbon filters basically utilize their carbon content in reducing and eliminating the odor that is caused by growing plants in a grow room. They are designed to filter gases through a bed of activated carbon (also called activated charcoal) and are usually used to combat volatile organic compounds released from common household products.

Aside from this, carbon filters also disintegrate pathogens that are found in the air that may cause harm to both plants and humans. Furthermore, it contaminates the air from toxic odors caused by chemicals.

Top 3 Best Carbon Filter For A Grow Room | Reviews

Some gardeners prefer to buy carbon filters on the market. However, there are also some that prefer to use a DIY carbon filter for their grow room. Making a carbon filter for your grow room basically needs cheap materials. This is mostly preferred by those who intend to save money since the finished product is considered a cheap carbon filter for grow tents. On the other hand, in most cases, it is not as efficient as the options on the market. So, we do not advise people to create their own carbon filters, except people that do not afford one.

Carbon filter

The best carbon filters for grow tents actually differ in size, capacity, price, and quality. Therefore, it is best to consider several factors to ensure that you purchase the best carbon filter for your grow room that suits your specific needs. What is the best carbon filter for a grow room? Check out our three favorites!

The #1 Best Carbon Filter For A Grow Room: 4-inch Carbon Filter with Australia Virgin Charcoal by iPower

This iPower carbon filter is a 4-inch carbon filter that features high-quality Australian virgin charcoal. This also features an odor control scrubber that is very useful in achieving the optimum performance of the product. This also includes a reversible flange and a pre-filter that helps in protecting the filter from being damaged. This actually prolongs the life expectancy of the product. Read the iPower carbon filter review below to know more about its features.


  • This product is very effective in absorbing any unpleasant odor with its premium 1050+ IAV Australia virgin charcoal, which is known to be one of the world’s most absorbent carbons.
  • Also, this product weighs 6 pounds with a dimension of 4” flange ducting x 12” length.
  • This also features a reversible flange and base. These prolong the service life of the product for up to 1.5 years.
  • In addition, it includes a pre-filter that is ideal to be replaced every 6 months to prevent the filter from damaging.
  • The product’s carbon layer has a thickness of 50mm to ensure higher capacity in absorbing undesirable odor and chemicals.
  • Last but not least,this carbon filter is made of high-quality and durable aluminum.


  • This product cannot handle very strong unpleasant odor.

The #2 Best Carbon Filter For A Grow Room: Air Carbon Filter with Australia Virgin Charcoal for Inline Fan by VIVOSUN

This carbon filter features one of the best charcoals available on the market which is the 1050+ RC Australia virgin charcoal. Furthermore, the product features a mesh (inner and outer), allowing more airflow (53% open area). This also features a reversible flange and base that extends the life expectancy of up to 2 years. The product comes in 4”, 6”, and 8”.


  • This carbon filter features 1050+ RC 48 Australia virgin charcoal bed that effectively removes most undesirable odors.
  • The product has a machine packed carbon with airflow that is 100% filtered.
  • In addition, it can be used in two different ways – as an intake filter and as an exhaust filter.
  • This product can be installed in four common methods – carbon filter and fan inside, carbon filter and fan outside, fan inside while the filter is outside, and filter inside while the fan is outside.
  • Last but not least, it comes with a changeable Velcro pre-filter and carbon filter belts.
  • This also includes a reversible flange and base which can extend the product service life up to 2 years.
  • This also features both inner and outer mesh that ensures 53% open area and an increased filtered air flow.


  • Some parts can be easily damaged.
  • This product cannot handle undesirable odor for a long period of time. So, regular cleaning is recommended.

The #3 Best Carbon Filter For A Grow Room: AC Infinity Air Carbon Filter 6″ with Premium Australian Virgin Charcoal, for Inline Duct Fan, Odor Control, Hydroponics, Grow Rooms

This product is another best charcoal filter manufactured by AC Infinity, designed to use activated carbon to eliminate odors and chemicals, popularly used for hydroponics, grow rooms, kitchens, smoking areas, and other ventilation projects. This is made of galvanized steel, making it highly durable. This is ideal for all types of indoor plants including tomatoes, pepper, cilantro, medical marijuana, and herbs.


  • It eatures premium-grade Australian Virgin charcoal bed rated at 1200+ IAV.
  • Also, it achieves a 38mm charcoal bed thickness and wider mesh openings thanks to a higher microporosity and surface area rating. 
  • Each air filter is made with RC412 pore-sized activated carbon that is highly adsorbable, drawing odor and gaseous compounds to each carbon piece.
  • Not to mention that the product includes an easy-to-wash sleeve that goes over the mesh body to prevent carbon residue from building up and keep the air filter clean.


  • On the other hand, this product is a bit expensive as compared to other products.

4 Qualities To Look For In a Carbon Filter

Basically, carbon filters utilize carbon in absorbing odor and bad smell. But how does it really work? Well, the filter absorbs air contaminants like unpleasant odor, pungent smell, allergens, and even pathogens. The carbon then reacts to these contaminants and traps them in the filter. Then, the filter screens out impurities and cleanses the air that goes through the filter before releasing it back into the air.

This process continues as long as the filter still contains carbon, as well as space for possible contaminants that can be detected in the air. Therefore, exactly because of this complex process, it’s not easy to look for the right carbon filter on the market. You have to consider the following factors in choosing your grow room filters.

1. Size

Carbon filters come in different sizes and lengths

Your chosen carbon filter should match all the components in your grow room so that it can work effectively. Some gardeners also consider that small grow tents can be used with small carbon filters like 3-inch carbon filters while large ones need large filters.

2. Thickness of the Carbon

Thick filter means the carbon filter contains more carbon

The thicker filter typically means more carbon. Thicker carbons have the capacity to perform more efficiently. However, take note that the thicker the carbon is, the higher the price can be.

3. Compact

Compact carbon filters perform better than ordinary ones

A compact carbon filter usually produces less noise and vibrations. Furthermore, compact carbon filters are capable of containing the absorbed odor and smell into the carbon granules as compared to the filters that have air pockets in between.

4. Highly Durable

Aluminum carbon filters are light and highly durable

Expensive but high-quality carbon filters are better than low-quality and cheap carbon filters. Remember that high-quality ones perform better and last longer. It is better to choose carbon filters that are made of aluminum since it is lighter and rust-resistant.

Tips and Tricks for Cleaning Your Carbon Filter

Cleaning your carbon filter is just very easy. Just follow these simple steps to successfully clean your carbon filter.

  1. Remove the carbon from the grow tent.
  2. Bring your removed carbon filter into an open area, preferably the outdoor part of your house as cleaning it might be a little bit messy.
  3. Shake off any dirt found around the carbon filter.
  4. Spray water onto the carbon filter using a garden hose to loosen the absorbed dirt.
  5. Dilute 1 cup of dishwashing soap into a bucket of warm water and submerge your carbon filter. Let it stay for 15 minutes.
  6. After 15 minutes, rinse the carbon filter and let it dry.

Final Thoughts

Last but not least, remember that before you set up a carbon filter, always consider the size of the components inside your grow tent. This is very important so that your chosen carbon filter would perfectly fit and work effectively in filtering contaminants. It is also necessary to consider the size of the filter. Small carbon filters are ideal for small grow tents while large ones are for large grow tents. Furthermore, quality should also be highly considered rather than the price.

Well, among the three products reviewed, I highly recommend the 4-inch Carbon Filter with Australia Virgin Charcoal by iPower. This product features a thicker carbon content which means that this product can actually work for a longer period of time. Not to mention that this product is available in different sizes; therefore, you have the option to buy the smaller ones or the bigger ones, regarding your needs.

So, now, it’s time for you to share all your thoughts, advice, and experiences when it comes to this topic. Therefore, tell us everything in the comment section below: What about you? What is your best carbon filter for your grow room? Share this with your friends to help you decide in choosing the best carbon filter for your indoor plants.

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