Pioneering Hydroponics

Since 1976

How to Eliminate Grow Room Smells

Grow rooms can have strong, unpleasant smells originating from volatile organic compounds that plants release.

There are a few things you can do to remove these odours from your grow room to ensure you have a lovely smelling environment.


Control Heat and Humidity

The production of volatile organic compounds is at its highest during flowering, especially when heat and humidity levels are high. You should also keep humidity levels low during flowering to prevent mould and bud rot.

Air circulation fans allow for even distribution of temperature to make sure your plants don’t have humid spots around them.


Odour Neutralisers

The Neutralizer has a patented system of heat transmission and a secret formula of essential oils. It maintains the temperature it needs to evaporate at a constant and controlled rate. This blend of essential oils is transformed into volatile particles that neutralise a wide range of foul smells.

Subtle yet powerful, FRESHHH!!! Odour Neutralisers will remove the stubborn and strong smells in your grow room. These complex, organic odour molecules neutralise the odours and remove them from the surrounding environment.


Use Carbon Filters

A carbon filter is the ideal way of eliminating smells from your grow room. These filters scrub odours from the air before extraction. They work by pulling in the air with the extractor fan through the carbon filter, having the air pass through an activated carbon bed. Any volatile organic compounds in the air that cause smells are trapped inside the activated carbon pores, meaning they are adsorbed.

  • Maximum airflow.

  • Large pores.

  • Granulated.

  • Low contact time effectiveness.

What to look for in a carbon filter:

  • Deep carbon bed. When choosing a carbon filter, deeper carbon beds are preferable, as they tend to last longer. The deeper they are, they more activated carbon they have.

  • Good airflow rate. To properly remove smells, air will need to be in contact with the carbon for long enough. The airflow rate of both the fan and the carbon filter need to match for successful odour removal.

  • Proper spigot size. The spigot size needs to match the diameter of the fan to make sure that both fan and filter can be properly connected. Reducers can be used if they don’t match, however, the spigot won’t be suitable for your fan’s airflow.


Make sure to maintain your filters by:

  • Replacing them when needed. You might need to replace your carbon filters every nine months to two years.

  • Replacing filter sleeves and pre-filters. These components stop dust from entering your carbon filter, which helps to protect its longevity. Replace the pre-filters and filter sleeves every three to six months to keep dust out.

  • Not using unfiltered water. When using an ultrasonic humidifier, for example, you shouldn’t use unfiltered water due to containing minerals. These will clog up your carbon filters and reduce their life.