3 Ways To Eliminate The Smell Of An Indoors Grow

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3 Ways To Eliminate The Smell Of An Indoors Grow

There is nothing quite as distinctive as the smell of cannabis. While many love it, many others do not. So do not take the risk of getting discovered by a nosy neighbour. Keep that air clean.

Growing cannabis indoors and keeping it stealthy can be a tricky business. The main reason? Smell. For those who live out in the middle of nowhere, with no neighbours or passing traffic, it is a concern that rarely bothers; yet for everyone else, great care has to be taken not to upset those around you with the sweet, pungent smell of weed. It isn’t just a case of keeping your grow hidden from potential thieves, but also one of common courtesy. So how do you keep the air smelling pure and clean? With these three methods.


A carbon filter, also sometimes referred to as a carbon scrubber, is the go-to method of air filtration for most indoor growers. These devices attach to the end of your grow room ventilation exhaust, removing any smell that passes through it. They do this with active carbon, which is able to absorb and bind the molecules in the air responsible for the smell.

A decent carbon filter will remove all smell without any kind of leakage. However, they require the air to be actively pushed or pulled through them using a ventilation system. This, combined with their reasonably large size, can sometimes make them unsuitable for those with super constrained space, or those conducting a micro-grow. However, for the vast majority of growers, a carbon filter is the way to go.

It is worth noting, when it comes to carbon filters, you get what you pay for. It is well worth investing in a reputable model than a cheap generic one that is likely to fail very quickly. All carbon filters have a lifespan and can only absorb so much – but high-quality ones last a great deal longer.


Not to be confused with harmful ozone generators, a negative ion generator gives air molecules an electrical charge. When they encounter other molecules, such as those carrying the smell of cannabis, they neutralise them, removing them from the air. It is completely safe to breathe, with some studies even finding them to be a health benefit. However, you will not want to put them in your actual grow room, but in the rooms outside them. In the grow room they will eliminate odour, but eliminate it too much, vastly reducing the flavour and aroma of your bud.

A negative ion generator is sometimes known as an air ioniser. They are a great addition to grow room security and very handy for the especially paranoid. The fact that they don’t need to be linked up to an exhaust also makes them a good choice of those growing one or two small plants in a very constrained space, although they will not be as reliable as using a carbon filter.


HEPA filters work by trapping molecule larger than 0.3 microns. This allows them to remove dust, allergens and other pollutants from the air. They can also be used to filter out some of the odour created by cannabis – especially if they have activated charcoal in them. Notice how we only say some of the odour; a HEPA filter is unlikely to completely remove smell, making it unsuitable for use on its own.

That being said, they can be extremely useful as a supplementary filter in the grow room, as they do not actually affect the cannabis plants themselves. They usually come with an inbuilt fan, forcing air through them and filtering out smell. This is particularly useful in situations where you can’t use ventilation system that vents outside, such as when using a grow tent; or when you just want that extra assurance that odour is not going to escape.

So, as you can see, there are a few ways of eliminating cannabis related odour from an indoor grow. Without a doubt, investing in a decent carbon filter is the best option, but there are other precautions you can take - especially if you are only growing 1 or 2 plants in a small area. Don’t take odour control lightly. At the end of the day, it is always better to be safe than sorry.



Written by: Josh
Writer, psychonaut and cannabis aficionado, Josh is Zamnesia’s in-house expert. He spends his days nestled out in the countryside, delving into the hidden depths of all things psychoactive in nature.

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