Carbon Filter – The definitive guide

They design activated carbon filters to filter air and gases and remove harmful substances and unpleasant smells from them.

What is a carbon filter?

We make them of carbon powder or granules that have been treated to be porous; They have a lot of tiny holes where dirty air may pass through. These minute spaces allow the carbon to attract and “absorb” impurities such as contaminants, chemicals, and allergens. When these pollutants are adsorbed, they stick on the surfaces of the carbon molecules, and they keep on sticking to it has saturated them. A saturated air filter is one with holes that have been filled up with these dirty particles.


Activated carbon air filters have different levels of efficiency. Some can only eliminate odors and large airborne particles, while others can deal with things that are as small as pollen, pet hair, dust, and mold spores. Most of them can handle common household chemical fumes and volatile organic compounds that float in an indoor space. To make them work effectively, the air in the space must circulate well and the filters replaced whenever they have exceeded their maximum capacity.

How to Make a DIY Activated Carbon Filter

This guide will take you step-by-step to make your own carbon filter. Plain carbon can absorb impurities. Activating carbon means increasing its surface area to provide more room for pollutants to adhere to. This is done by both chemical and physical processes.

To make activated carbon, the first thing you need is charcoal. Burning dry wood or plant fiber at 1,000–1,300 degrees Fahrenheit may help you produce it. The goal is to obtain carbon out of the substance you burned.

Grind the charcoal with a mortar and pestle until it turns into a black powder. Breaking up the carbon this way enables it to be in contact with air molecules.

After physically treating the carbon, chemical treatment follows. Get a 25% solution of calcium chloride or bleach–you can make it on your own by mixing 1 part of the chemical with 3 parts of pure water. Mix this solution with the charcoal powder until they form a thick paste. Be careful though; The mixture will heat so you must wear thick gloves to protect your hands. If you dislike working with chemicals, lemon juice may also work.

When you’ve mixed them up thoroughly, spread it until it dries. Let this sit for a day. Afterward, put the charcoal on top of a filter and rinse it with clean water to remove debris. Let this dry again. Bake the paste at 230 degrees Fahrenheit for at least half an hour. When this is done, your carbon is already activated. To use it for filtering air, you put the charcoal into a tiny box and put that inside your air filter. You may also put the charcoal into small bowls and put them in places that frequently accumulate bad smells, such as in the toilet or kitchen.

Where to Buy it?

Activated air carbon filters are available from hardware stores that sell air filters and air purifiers. You can buy them online, too. Although making your own air filter may be fun, it is tough work. Consider purchasing one instead to get guaranteed air purification.