carbon filter close up

Carbon Filters for Growing Weed – A Full Guide

Carbon Filters for Growing Weed - A Full Guide

As a marijuana grower, you know that once your plants begin to flower, they are bound to smell, Heavily! The more trichomes, terpenes, and buds, the harder the smell.
Keep in mind that the cannabis smell is distinct, and even those who aren’t familiar with weed can still recognise it. 
If you’re looking to purchase a carbon filter for the first time, or need to deepen your knowledge for what the best carbon filters for growing weed are, this full guide is exactly what you need.

If you are growing in an area where it is illegal, you may be in deep trouble once “the law” or neighbours sense the distinct smell of marijuana.
This is why it’s crucial to find an effective carbon filter. If you install it correctly, it won’t just prevent the smell from leaking outside, but also smelling up your grow house.

If you are planning to set up a grow house for the first time, it may seem weird how a single device can easily make a smell extinct. But when you apply a little chemistry, it all becomes clear. Carbon filters use activated carbon, which takes out impurities and contaminants through chemical adsorption.

The small pieces of activated carbon offer a large surface and plenty of pores. It’s the pores that “trap” the contaminants, leaving you with clean, odorless air. It is important to understand that the carbon filters get full after a particular period of filtering. This is because the activated carbon is filled with contaminants that it cannot absorb any more, rendering your filter useless.

While filters can last a long time, you should check them regularly and make replacements on time. The carbon filter should be connected to your exhaust fan because it forces all the extracted air from the grow room to pass through the filter. For cannabis growers who have a small indoor setup, the granular carbon filter is an excellent choice.

If it is a large operation, you probably have to opt for the block carbon filter.

Activated carbon filter 3d illustration

Does the Size of Your Filter Really Matter?

Many indoor cannabis growers believe that the bigger the fan and carbon filter’s size, the better they are at controlling the marijuana aroma. This is not entirely true because there is a way to find the right size of the carbon filter and fan for your grow space. To settle on the correct sizes, you should calculate the cubic meters of your grow house (multiply the length, width, and height).

The carbon filter size that’s right for you and the corresponding fan is listed in cubic meters per second. You need to make sure that your fan CFM (Cubic feet per minute) matches the cubic feet of your grow room. If you already have a carbon filter installed, your fan CFM should be 20% more than your room’s square feet.

If you are growing cannabis in a small tent, a single 4-inch fan works perfectly fine in moving air. If you choose to use a single fan, it is recommended that you use it as an exhaust(extractor) fan instead of an so that you can use a carbon filter. Given that carbon filters are part of the exhaust system, they’ll cause negative pressure inside your tent, something that plants don’t like. To counter this, you need to open your   if you already have them installed.

As a casual grower exchanging air every two to five minutes is good enough and won’t affect your yields. It’s, however important that you stay at the right humidity and temperature range. The ideal temperature should be 30 degrees Celsius or 85 degrees Fahrenheit when the lights are on. If your lights are off, the temperature should not drop greater than 15 degrees.

The seedling stage’s recommended humidity is 70-80%, 40 to 70% for the vegetative stage, and 40-50% for the flowering stage. Take note that if wet spots are forming on leaves during the vegetative stage, your humidity levels are too high. At the flowering stage, your cannabis plants have a robust root system to meet their water needs.

At this stage, the plants still absorb water through the leaves. This is the reason why you need to lower the humidity level to prevent the formation of mildew and mold from forming. The mildew and mold infect the plants from the inside, so it isn’t visible at first. As a grower, you may find it difficult to keep the right balance of temperature and humidity throughout the plant life cycle. There are a few handy tips to lower temperature and humidity.

First, you need to add a dehumidifier to regulate the humidity of your growing areas. Also, make sure that you water your plants when lights are turned on in your grow house. Don’t forget to increase cool, fresh air in the growing area. To increase temperature and humidity surround the room with open containers of water and moist towel. You should also keep the soil surface moist.

Routine Maintenance Practices: Keep your Filter Working Longer

You must conduct regular maintenance on your filter system to make sure that it’s working correctly. This means that you have to undertake routine checks on the activated carbon and odor sock inside. Make sure that you remove the sock, wash it, and then replace it every two months.

Ensure that you check on the carbon too, you don’t want to have it compacting inside.

The best way to go about this is by placing it upwards on the ground then hit it lightly a couple of times. This just to make sure that the carbon is moving around inside. When carbon compacts, it will hardly pass air through, and this means that your exhaust fan will work overtime and ultimately break due to overheating. This also poses a significant danger to electrical installations, especially if they were faulty in any way.

Take note that carbon filters still have a shelf life. This is why you should check with the manufacturer to confirm its durability. If its already used, any odors that come from your grow house will pass unfiltered. If you don’t plan on using your filter until your plants are in the flowering stage, clean your filter and soak cover.

Don’t forget to place the cover back to its original packaging until you can use it again. You can even pop in a few silicon sachets just to keep humidity down. Store it in a dark but dry place until such a time that you will need it.

3 used carbon filters

Invest Wisely: Choosing the Best Carbon Filter for your Grow Room 

While you may choose to install any type of carbon filter on your grow house or tent, you must settle on one that best serves your needs. There are many cheap options available in the market, but it’s worth finding one that best suits your cannabis growing needs.

When searching for a carbon filter for your grow room, there are a couple of things you need to take into account. If your filter meets any of these criteria, the chances are that you’ll get better performance from the product. 

What's Contained in the Carbon Filter?

Activated carbon filters are the most recommended types. This is because they contain charcoal that has been exposed to high steam and temperature in the absence of oxygen. This type of carbon also has a microporous structure, providing a large surface area to volume ratio. This helps to facilitate adsorption.

It is important to note that the carbon filter’s performance is determined by the activation process and the amount of carbon present. That being said, the more the carbon in the filter, the more effective it will be, and the longer it will last. Also, carbon filters with a thicker filter bed will have more carbon. If you are looking to invest in a top-rated activated carbon filter, the TerraBloom Activated Charcoal Filter will be an excellent investment.

Aside from its durable construction, the carbon bed integrated into the unit is machine packed and 1.8 inches(46mm). This is the recommended filter bed size that will give you offer you a great return for your investment. It is also worth pointing out that it features small granules for better filtration.

A Pre-Filter Included

Carbon Filters for Growing Weed - A Full GuideCarbon Filters for Growing Weed - A Full GuideYou can extend the life of your carbon filter by using a less expensive pre-filter to remove impurities in your indoor weed grow house. This is an additional investment you often shouldn’t consider because most of the top-rated carbon filters come with a pre-filter to remove sediments. A pre-filter is a barrier between the outside air and the carbon layer designed to remove large particles that can clog your ductwork and carbon filter in your grow house. Some growers refer to them as 360-degree ventilation solutions for their growing system.

The advantage of filters with carbon and pre-filter sharing over those with a pre-filter in a separate canister is that they are a lot easier to maintain. They also catch large contaminants that would otherwise pass through the carbon. The Hon and Guan is a good example of a carbon filter with pre-filter included. This is, however, not the only reason you’ll want to invest in this device. Take note that the filter flange and the base of the main structure are interchangeable.

This means that the inner and outer carbon filter mesh has enough open area for superior airflow.

Durability and Materials

Carbon Filters for Growing Weed - A Full GuideCarbon Filters for Growing Weed - A Full GuideWhen searching for a carbon filter for your grow house, you should settle for one built from the most durable material, especially aluminum on the flanges and base. Aluminum isn’t just light, but it is durable and can withstand continuous use. If you want a return on investment, the iPower 4-Inch Carbon Filter is an excellent choice for maximum strength and superior lasting effects.

This professional-grade filter has a cap engineered from high-quality aluminum. You’ll also love its sleek four-layer construction with an inner mesh, virgin charcoal bed, and outer mesh.

Get the Best Results with The Right Carbon Filter!

Whether you are a beginner or an experienced outdoor grower, growing tents, or indoor grow houses are a perfect solution for your indoor cannabis growth. It’s thus crucial that the room ventilated correctly. This means investing in a carbon filter that will provide you with the best results when it comes to can filtering the strong marijuana smell.

A high-quality activated carbon filter is the best choice you can make for your indoor grow house because such filters are known to provide an exceptional result. Don’t forget that thicker carbon filters beads have a longer life span and are effective at controlling the strong weed odor.

Carbon Filters for Growing Weed - A Full Guide

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