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Do I Need A Carbon Filter In My Grow Room?

Is A Carbon Filter Necessary?

To answer the above question quickly, No. A Co2 filter (sometimes called carbon scrubber) isn’t, technically, necessary. You can grow a perfectly fine crop without having a carbon filter in your grow tent or grow room.

Most indoor growers though will need more than just a grow light and a grow tent as carbon air filters are excellent odor neutralizers. So, if you want to keep your cannabis growing operation secret, or you simply want to escape the distinctive weed smell, a carbon filter is a must-have for a home, indoor gardener.

How Does The C02 Filter help?

A carbon filter helps in several areas, with the most important reasons being listed below:

  • Air Purification-A C02 filter is able to filter out pollutants from getting inside your grow tent and potentially damaging your crops.
  • Smell Control– A quality carbon filter will help reduce or even eliminate the distinctive weed smell that comes from terpenes.

How Does A Carbon Filter Work?

The vast majority of all C02 filters use activated carbon (AKA “activated charcoal”) for their filtration or scrubbing. Activated carbon is specially manufactured to have tiny holes or pores, which results in more holes per filter. In short, more holes on a filter equals better filtration.

If you are curious, look at the appendix for more info on activated carbon.

If you know what a sponge does, you will know the theory behind a carbon filter. The carbon filters simply capture, like a sponge, various containments and stop them from going outside the tent; also it prevents bad air from getting inside your grow room. In the case of a weed, the pollutants are terpenes.

How Can You Gauge The Efficiency Of A Carbon Filtering System?

CFM or cubic feet per minute is the standard that you should look for when it comes to air filters. CFM indicates how many cubic feet per minute a carbon scrubber can filter.

The CFM size that you need depends upon the size of your grow room. So, more CFM is not necessarily better. Check this article out for a guideline on what CFM size you should purchase.

Top Brands

The Phresh Carbon Filter is one of the top-rated, filters on the market. The Phresh Filter is expensive but affordable. However, it is not a HEPA filter.


Proper Grow Area Ventilation System

And Exhaust System Also Needed

Along with a quality air carbon filter, you will also need a suitable ventilation system for your grow tent or grow room. The grow tent‘s veniliation system creates a vacuum-like effect in your grow area as it works to suck the bad air out. Otherwise, without a ventilation system, the overall environment would be stagnant.

On a side note, ventilation for a grow room has numerous other purposes other than maximizing air circulation. They also help with odor control and work to prevent mildew from creeping up on your plants.

A suitable ventilation system consists of both a circulating and inline fan. Both those combined allow the air to circulate, which in turn means that the filter can do its work.

Grow tent or grow room ventilation will have the following:

  • Circulating Fan or Oscillating Fan-The circulating fan’s job is to mimic the breezes that your plants would get if the plants were growing outside. How many and the power that you will need depends upon how big and how many grow tents that you have.
  • Exhaust Fan or Inline Fan-The inline fan is used to take in new air and expel out the old air through via ducting. An inline fan combined with a carbon filter can make the air from a growing area odorless.

Final Thoughts

As I stated a charcoal filter isn’t necessarily needed. However, it should be mandatory for all indoor growers, who live in the city or who have visitors over often. So, do your research, and get the best one for your particular situation.


Ozone Generators

Ozone generators are marketed as an air, quality, control device. Some of the manufacturers claim that they will help with both air quality and also help control smells. The question though, is do they work, and if so, to what extent should you use them in your grow room or grow tent?

How Do They Work?

It makes ozone by separating oxygen molecules into a single atom. This single atom then will morph into other oxygen molecules that in turn produce Ozone. Currently, the conversion is done by either electricity or ultraviolet radiation.

Is Ozone Dangerous?

Yes, too much of it can damage your lungs and cause chest pain, breathing issues, and it will give you a soar throat. Additionally, it can be especially harmful to people that have asthma, COPD, or other respiratory afflictions.

Do They Help With Air Quality?

Per the EPA, no. The EPA states that ozone levels that do not exceed the listed safe levels will not scrub out of eliminating any indoor air pollutants. Obviously, ozone generators are only designed to produce safe levels of gas. So, based upon the EPA, the only way it would be effective would be if it generated unsafe levels of ozone.

Do They Work For Odor Control?

The EPA does not mention anything concerning ozone generator and odor control. I did find an article, which stated that the changing of the composition of the oxygen molecule might result in eliminating odors.

Final Thoughts

Stay away from ozone generators and use that money instead to purchase a better grow tent ventilation and carbon air filter.


What Is Activated Carbon?

As stated earlier, activated carbon is made to have more holes than regular carbon, which means that it absorbs smells better and able to filter out more pollutants than standard carbon. Charcoal has been used for centuries as a filter. In fact, gas masks in World War I even used carbon filters. So, if activated carbon filters can protect soldiers from mustard gas or another chemical, it sure can work as an effective odor neutralizer.

Activated carbon or charcoal filter is made from burnt wood or even coconut shells that are burnt at temperatures exceeding 400 degrees. Afterward, it is cooked again at over 800 degrees. (They are also treated with a substance that makes the carbon have even more holes than non-treated charcoal)

It can absorb both air and water. Nearly all carbon filters, use activated carbon for air filtration and grow room smell control.