Black & Blum

Active Binchotan Charcoal Water Filter


Binchotan active charcoal is used to filter water by absorbing impurities such as chlorine, and adding minerals such as calcium. These charcoal refills are pre-washed and vacuum sealed so they are ready for immediate use. Simply drop the charcoal into your water, we recommend one stick per litre, then leave for 1 hour and enjoy your filtered water. Each charcoal will last for 6 months as a water filter. They are then recyclable for other uses around the home, such as plant fertiliser.

The natural charcoal filter can also come with a locking coil that upgrades any standard bottle into a ‘filter bottle’ using a traditional Japanese Binchotan charcoal method for cleaner tasting water.

Why do you use Binchotan
Binchotan charcoal has been used for centuries in Japan to purify and soften water. As an active carbon it attracts contaminants like chlorine and binds them to its surface, away from the water you drink.

How quickly will it work?
You will notice the difference in taste in about 1 hour, but it ideally can be left overnight for first use. The charcoal can be used directly from the packaging, straight into the coil and into your bottle or jug.

When will it run out?
After about 3 months, you may notice a decline in taste. At this point, you can simply boil the charcoal in water for 10 minutes to recharge it, then use for an additional 3 months.


Removes Chlorine
Adds Minerals
Natural Water Filter lasts for 6 months
High quality stainless steel

Where did Binchotan charcoal come from?
It was during the Edo Period (17th century) that a man called Binchuya Chozaemon made it popular, but the origins are not completely clear. A form of Binchotan charcoal (sometimes referred to as 'white charcoal') is thought to have been introduced to Japan by a Japanese monk and scholar called Kukai 1,200 years ago.

What is the process for making Binchotan charcoal?
This ancient process for making Binchotan charcoal is very interesting, and also intense. The wood needs to be raised to very high temperatures in a kiln, and then rapidly cooled by being covered in a mixture of soil, sand and ash. This gives the charcoal it’s very hard and smooth appearance, and if you tap it, you’ll hear a clear, metallic sound.

What makes it a good water filter?
Not only does Binchotan charcoal remove impurities from water, it can also release minerals back into your bottle, improving health and taste. The surface of the charcoal is full of tiny holes, which draw in contaminants like chlorine and bind them, away from the water you drink. There’s so many holes in Binchotan charcoal that the surface area of just 1 gram is 500mᒾ.

What capacity does one charcoal stick filter?
It will filter about 1.1L of water for 3 months if used every day. If you’ve got a larger container or jug you want to filter, just increase the number of charcoal sticks accordingly.

How long does each stick last?
3 months, if using every day and in our ‘Eau Good’ bottle, or another 800ml bottle. Afterwards, you can just boil it for 10 minutes to ‘recharge’ the charcoal, and then use it for another 3 months.

Should I throw away my charcoal stick when it’s finished?
Absolutely not, one of the wonderful things about this special charcoal is that it has so many great secondary uses. It can remove the moisture from the air in your wardrobe, helping your clothes avoid becoming mouldy, it also absorbs bad smells, so it is great to use in a cat litter or nappy bin. It even adds nutrients to the soil of houseplants if you break it up and add to the pot.

Does the charcoal need to be washed or cleaned?
There is no need to, it can go straight from the packaging into your bottle.

Can I add things to flavour my water if I also use a charcoal stick?
If you want to use your Binchotan charcoal water filter, you CANNOT add anything else to the carafe or bottle.

Is charcoal dangerous if swallowed?
No, it isn’t dangerous to swallow charcoal. Active charcoal actually has many medical uses such as being used to treat flatulence, high cholesterol and upset stomachs.

Am I able to wash my bottle with soap?
When washing your bottle, carafe or other vessel with soap, make sure you remove the charcoal stick first.

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