All your hydroponic growing needs, supplies, advice and more

Air and Ventilation:

Plants need plenty of fresh air and carbon dioxide to thrive in an indoor environment.

To give them both of these, in the proper amounts, you need to have adequate ventilation as well as plenty of oxygen to the root zone of your plants.

There needs to be fresh air coming in to the grow room while air that is low in carbon dioxide and high in humidity is vented out.

This is where fans and controls come into play.

There are different types of fans available for all different sizes of rooms but they mostly all have the same function. They vent air out of the room.

A simple set up would be an inlet from the outside allowing cooler, fresh air in.

A vent fan would be set up on the opposite side of the room venting air out.

Ventilation controllers are available for many different applications. (SP)

The main concerns for the indoor gardener are humidity and temperature which are usually controlled by a humidistat and a cooling thermostat.

These can be bought separately or both together in the same controller.


Sometimes air conditioning and or dehumidifying are used depending on how much heat or humidity needs to be taken care of.

Carbon Dioxide, or C02

Simply put, Carbon dioxide is used by plants to produce energy to grow.

Plants must maintain a healthy amount of C02, especially during the daylight stage when they are growing the most.

During the day plants breath in C02 and exhale oxygen. During the night they do the opposite.

Some growers use C02 enrichment to enhance certain qualities in their product.

Rapid plant growth and heavy fruit yield are the most common reasons.

Studies show that optimum C02 levels can increase weight up to 30% or more.

Indoor C02 enrichment can be done 4 main ways by the gardener.

Bottled gas which is piped in and used by the plants at optimum times.

C02 burners which use propane or natural gas.

There are a couple of different mineral or chemical mixes that can add C02.

And finally, there are different fungi cultures that emit C02 from bags of growing fungi on different substrates.

Air Supply

As mentioned before, a constant air supply is needed to the root zone in any hydroponic system.

This is done by adding air to the nutrient solution using and air pump and air stones or bubblers. (SP)


In a single bucket system or DWC, the bucket becomes the reservoir, so the air stone would be placed right in the bottom of the bucket.

In a RDWC there is a reservoir plus a certain amount left in the bucket where air could be added as well so sometimes there are many air stones in use in a system.


One last short section to deal with odors.

There are only a few reliable ways to deal with crop odors.

The easiest way is to just vent them outside along with you’re hot, humid air.

However, this isn’t always possible in a home grow room situation.

Fortunately, we have a few different products that will help with this situation if it arises 😊

Odor Neutralizers

The first one, and the most cost efficient for a small grower is using odor neutralizers. They capture and bind the odors.

Some are scented. 

These are reusable for quite a while, depending on the number of odors that they have to trap.

They can be used by just setting them around the area in small cups or used with dispensers.

They can also be used by just placing them in the outlet vent, so they capture the odors before they can leave the room.

Some people say that if they are used directly in the grow room that they will take the scent and smell from your crop.


Ozone Generatorss

The next type of odor control system is called an ozone generator and has been used for many years.

Back when you could still smoke in a bar or restaurant they had huge filters, usually on the ceilings, called smoke eaters. Every now and again they would snap like a bug zapper and release ozone into the air by an electrical charge that changes O2 to O3, ozone.

This oxidizes the air effectively pulling smoke, odors and other pollutants out of the air.

Ozone can be harmful to humans at certain levels, but regulation seems to be lacking on ozone generators as well as home air filtering systems in some places so if you use any type of ozone filter or generator, have it so that you can shut it off when you are working in your grow room.

Both of these last two types of odor control work fine in smaller grow rooms.

Depending on what crop or strains you are growing, odor may not present a huge problem anyway.

The last type of odor control is easily the most popular for larger grow rooms.

Activated Carbon

They are called activated carbon filters.

Activated carbon has been used for extensively over the years including water and air filters in many homes.

To put it simply, organic compounds in the air or water react chemically with the carbon causing them to stick to the filter.

Again, this could be a course all in itself but I use what I know works and what is affordable or available at the time.

These filters are usually rated for hours depending on use and CFM. Some are reusable meaning that you can just replace the activated carbon and keep the filter housing.