DIY Activated Charcoal

How to Make DIY Activated Charcoal for Prepping and Survival

From filtering water to making your own gas mask or treating a poisoning, activated charcoal has a lot of valuable uses in a survival situation.

Making your own takes time but it is ultimately more cost effective.

A pound of activated charcoal costs $12-$15 while making your own is less than $1 per pound.

This means for $20 you can put back enough activated charcoal to have on hand for barter, trade, or helping others during a survival situation.

Instructions For Making Your Own

Making Hardwood CHarcoal

While you can make your own charcoal to activate, the extreme temperatures that it takes to burn hardwood down to charcoal, makes it very time consuming and energy intensive.

Instead I recommend buying a 20 lb bag of hardwood charcoal and using that.

During a survival situation you may have to make your own charcoal (more below), but if times are still good enough to just buy it you will come out ahead on the deal.

To make charcoal from burning hardwoods.

  1. Gather a large pile of hardwood. Make sure you have a good spot to burn for a long time and you can access it to feed it. A lot of people use a metal barrel.
  2. Chop hardwood into small pieces. You want to maximize how much you can fit in the barrel.
  3. Build up a big bonfire that will burn for 3-5 hours around your barrel. The length of time is dependent on how big your barrel is and how full you have it. A 55 gallon metal barrel full of wood needs the 5 hour time.
  4. Let the barrel cool overnight or more before opening.

You can make a lot of charcoal this way and the bonfire on the outside can be made from old wood that is laying around your property or even slag from a sawmill if you can get it.

Supplies Needed To Activate Charcoal

1. Calcium chloride otherwise known as Pickle Crisp.

It is most economical to buy in the larger tubs like that offered by Hoosier Hill.

You can use the Ball Pickle Crisp that is available at grocery stores but it is usually a lot more money. 

2. Charcoal

Buy whatever hardwood charcoal briquettes you prefer.

Just make sure you don’t accidentally get the type that is already soaked in lighter fluid or has any other additives whatsoever. You need pure hardwood charcoal.

3. Glass Jar or other non aluminum mixing unit with a solid lid.

Many people use a regular canning jar.

Mixing the calcium chloride causes a reaction that releases heat and aluminum is a reactive metal. You don’t want to get this on  your hands either so use something you know doesn’t have a leak. Eye protection is always a good idea just in case.

4. Water and measuring cup

5. Cheesecloth Or White Sheet

6. Cookie Sheet or Flat Pan

7. Storage Container For Finished Activated Charcoal


  1. Powder the charcoal. You can do this by smashing with a hammer or similar. Transfer to a glass or stainless steel bowl. Again, do not use aluminum.
  2. Make a 25% solution of calcium chloride using your water. 100 grams of calcium chloride would be dissolved in 300mL of water. In ounces this is equal to 3.5 ounces of calcium chloride and 1.3 cups of water. USE GLOVES. THE JAR WILL BECOME HOT! You can loosen the lid a little to release some heat and then reseal. You can of course mix more of this if you want to make a very large batch of activated charcoal but best not to mix more than you will need.
  3. Slowly add the calcium chloride solution to the powdered charcoal and mix until a spreadable paste has formed. Discard any leftover solution or powder up some more charcoal right away and mix some more up.
  4. Let dry for 24 hours in the bowl.
  5. Spread on a clean white sheet or multiple levels of cheesecloth. IT IS CRITICAL THAT YOU USE NOTHING THAT HAS ANY DETERGENT RESIDUES OR SCENTS. Rinse with clean water and catch the water that goes through. You can filter this water through a coffee filter to recover the carbon you would otherwise lose. Put the coffee filter on a cookie sheet with the rest of your activated charcoal.
  6. Bake what you have rinsed at 250 F for 30 minutes or until all moisture is entirely gone.
  7. Cool and break apart to store in an airtight and waterproof jar.

Here is an excellent video on the process.

The Difference Between Activated and Regular Charcoal

Activated charcoal is hardwood charcoal that has been treated to increase the surface area of the carbon particles by creating small pores. This activated charcoal is capable of absorbing more toxins, impurities, and gases.

While regular charcoal has some absorbing capabilities it should never be used in place of activated charcoal since the level of absorption is far less.

Survival Uses For Activated Charcoal

1. Emergency water filter

Some filters have sections that require activated charcoal. It can be used to reduce and eliminate chlorine, fluoride, and other compounds and tastes that you don’t desire in your water.

Here is a great video showing how to use activated charcoal to make a high volume water filter using only a 2 liter soda bottle, activated charcoal, and a coffee filter.

2. Remedy for ingested poisons including overindulgence in alcohol

Charcoal absorbs toxins and that means that it can save a life. If a poison is ingested, then eating some activated charcoal can reduce the effects.

Some people use activated charcoal if they have too much alcohol to drink. This means that if alcohol poisoning is suspected, charcoal can help reduce blood alcohol levels.

To Treat Poisoning

It is important to remember to give activated charcoal as soon as possible. The best time is within 30 minutes of a poison being consumed. Activated charcoal should never be given to children under 1 year of age.

For a one dose treatment adults should take 50-100 grams of activated charcoal powder mixed with water. Children 1-12 should be give 25-50 grams in water. This translates to about 0.25-0.5 grams per lb of body weight.

If poisoning is severe enough to require a course of treatments then the Mayo Clinic recommends using 50-100 grams mixed with water and then continuing treatment with a smaller dose of either 12.5 grams given every hour, 25 grams given every two hours, or 50 grams given every four hours for adults.

Children up to 13 years of age should be given a first dose of 10 to 25 grams then they should be given 0.5-1 gram per pound of body weight every two to four hours.

Although charcoal in water does not taste good it is important to not put it in ice cream, chocolate milk or sherbet because this can decrease the absorptive qualities and make the treatment not as quick or effective.

With any case of poisoning you should seek formal medical treatment as soon as possible.

The Poison Control Center has a lot of information and a 24 hour number to help. They are an excellent resource for advice and support. 

Source For Dosages: The Mayo Clinic

3. Make Your Own Gas Mask

Note: This mask can help you out a lot but it is not a replacement for a real gas mask. It is a lot better than nothing and can allow you to minimize your exposure and damage to volatile organic compounds and environmental pollutants.

What you need to get started:

  1. 2 liter soda bottle
  2. Soda can
  3. Activated charcoal
  4. Rubber bands
  5. Duct or medical tape
  6. Cotton Rounds Or Stuffing
  7. Scissors

Instructions Are In The Video Below Courtesy of Black Scout Survival

4 . Treat insects bites and stings, including particularly venomous ones!

During a survival situation you will often experience conditions that expose you to stinging and biting insects and other animals.

To use for bites and stings mix a capsule of activated charcoal with 1/2 tbsp coconut oil and apply. You are going to need a covering unless you want to risk staining things with the charcoal.

It is amazing that you can treat snake and spider bites as well.

Very venomous spider bites like those of the Black Widow and dreaded Brown Recluse can be treated by creating a larger amount of the capsule and coconut oil mixture.

You are going to want a large wrap like an ace bandage

Remove after 2-3 hours, rinse the area, apply a fresh mixture again and wrap.

Where to Buy Activated Charcoal

It is quite easy to order activated charcoal online and it is not even that expensive.

The thing is that it can become a lot harder to get even basic things during a survival situation. If you don’t want to or can’t make your own activated charcoal then here are some links.

Remember that if it does get wet you can dry it out by putting it back in the oven at 250 degrees.

Buying Options

If you just want capsules check out Natures Way. Very well rated on Amazon.

 Zen Charcoal Powder 

Buying in bulk is the way to go if you are getting just the powder.

This Charcoal powder comes in a resealable bag and is a good value for the amount you get.

A few things to remember when using activated charcoal

Activated charcoal can interact with some medications

Make sure to double check any prescriptions you are taking to see if they interact with activated charcoal at all. This is very important.

While charcoal is excellent for detoxifying you do want to make sure that you are taking care of other aspects of your health.

The Mayo Clinic has a list of drugs known to interact with activated charcoal but you should definitely ask your doctor or pharmacist about using activated charcoal if you are taking prescription medications or have any on going health issues.

Charcoal stains like crazy

A lot of people choose to use charcoal capsules because it avoids the risk of staining anything unless you break one open. It also makes it very easy to know what dosage level you are using for a given remedy or compound.

A little goes a long way

Activated charcoal is concentrated stuff so remember to use sparingly.

This also means that a small stash can take you through a lot. Having 10 lbs of activated charcoal could also put you a valuable position for bartering because it has so many uses.

Do you have any experience using activated charcoal in a survival or off grid situation? Please share with us in the comments below!

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