Best Activated Carbon Filters for Joints: Sizes, Brands & Comparison
Nick Will
The best activated carbon filters for joints are those with a diameter that matches your paper, draw evenly, and do not clog. There is no such thing as a universally "best" brand: the deciding factors are size, shape, filling, and how much you roll.
In this guide, we compare activated carbon filters by diameter, shape (straight or conical), type of carbon, brand, and price per filter. By the end, you will know which filter suits your rolling style and what you should look for when buying. You can find all the filters in our shop collected under Activated Carbon Filters at Skunaby.
What are activated carbon filters?
An activated carbon filter for joints is a small tube filled with activated carbon granules and capped at both ends. It replaces the classic cardboard tip as a mouthpiece.
Activated carbon has a very large internal surface area. As you inhale, smoke flows through this filling, and some substances are deposited onto the carbon. This is a purely physical effect.
To help you find the right thing
- Cardboard tip / Filter tip: A rolled piece of cardboard without filling. It gives the joint shape and a mouthpiece, but does not filter.
- Activated carbon filter for joints: A ready-made tube with a carbon filling, usually about 5 to 10 mm in diameter and 25 to 27 mm long.
- Activated carbon filter for grow boxes: Large air filters for ventilation systems. Anyone searching simply for "activated carbon filter" often ends up here. They have nothing to do with joints.
What are the benefits of activated carbon filters?
Honestly: Activated carbon filters are not a miracle cure, and they do not make smoking harmless. What many regular rollers appreciate in everyday life are practical points:
- Stable mouthpiece: The joint retains its shape until the end.
- No material in your mouth: The end cap keeps crumbs out.
- Even draw: A good filter provides a predictable draw and does not collapse.
- Different smoking sensation: Many find the smoke milder with an activated carbon filter. How noticeable this is is subjective and depends on the filter, filling, and rolling style.
Because perception varies so much, it is worth comparing based on clear criteria rather than advertising promises.
How do you recognize good activated carbon filters?
These six criteria determine your satisfaction or frustration in everyday use:
| Criterion | What to look for | Why it is important |
|---|---|---|
| Diameter | matches paper and joint size | too thick: paper tears or is under tension; too thin: filter slips |
| Shape | straight or conical | conical filters sit more stably in cone-shaped joints |
| Carbon type | coconut shell or coal | influences the draw, the choice is a matter of taste |
| End caps | heat-resistant ceramic caps | keep the carbon in the filter and ensure a clean draw |
| Packaging | box, bag, or jar | decides on storage and portability |
| Price per filter | pack price divided by quantity | larger packs are usually cheaper per piece |
All activated carbon filters we carry at Skunaby have ceramic caps. Important for everyone: Activated carbon absorbs moisture from the air. Therefore, store your filters in a dry and sealed place.
Which size fits your paper?
The size of an activated carbon filter is indicated by its diameter. Manufacturers use their own names such as "Slim" or "XTRA Slim." This overview shows what is behind them (dimensions according to manufacturer specifications):
| Format | Diameter × Length | At Skunaby for example | Fits well with |
|---|---|---|---|
| Super Slim | ø 5.0 × 26.9 mm | currently out of stock | very thin joints |
| XTRA Slim (PURIZE) | ø 5.9 × 26.9 mm | PURIZE 10x Box, Color Mix 33x, Rainbow 50x, Colored 100x Jar | King Size Slim, long papers |
| Slim (GIZEH) | ø 6.0 × 27.0 mm | GIZEH Pink 50x, All Pink 34x, paper + filter sets | King Size Slim, long papers |
| Slim Plus (OCB) | ø 7.0 × 27.0 mm | OCB Premium 10x and 50x | slightly wider king-size joints |
| Plus Size | ø 8.0 × 27.0 mm | currently out of stock | wide joints, paper rolls |
| Big Size | ø up to 10 mm | currently out of stock | very large joints with high volume |
As a rule of thumb: For King Size Slim papers, a filter of around 6 mm is almost always correct. If you roll wider or looser, a 7 mm filter like the OCB Premium fits. Big-Size filters with a diameter of up to 10 mm are intended for very large joints and require wide paper or paper rolls. Which papers fit which joint is explained in the guide Best Papers: Longpapers, King Size Slim & Rolls.
Straight or conical?
Straight activated carbon filters have the same diameter over their entire length. They are the standard, fit in almost every joint, and are easy to insert.
Conical activated carbon filters taper toward one end. This makes them sit more stably in cone-shaped joints and they slip less. At Skunaby, there are two variants:
- PURIZE Conical: ø 5.4 to 5.9 mm, 25.0 mm long, in a 42-count jar. PURIZE Conical 42x jar
- GIZEH Conical: ø 6.0 to 7.0 mm, 27.0 mm long, in a 10-pack box. GIZEH Conical Filter
In short: If you roll straight and even, use a straight filter. If you roll classic cone joints, try conical filters. More on this in the detailed guide Conical Activated Carbon Filters: Advantages & Comparison and in the category Conical Filters.
Coconut-based or coal-based carbon?
Not all activated carbon is the same. For joint filters, you primarily encounter two raw materials:
- Activated carbon from coconut shells: used by PURIZE and GIZEH for all activated carbon filters that we carry.
- Activated carbon from coal: used by OCB for their standard activated carbon filters, including the OCB Premium.
Which carbon you prefer is primarily a question of personal draw preference. There is no objective "better." If you are unsure, test both variants in small packs side by side.
PURIZE, GIZEH, and OCB compared
We carry activated carbon filters from three brands. Instead of crowning a test winner, we will show you the differences according to the manufacturer specifications:
| Brand | Carbon & Caps | Straight Filters | Conical | Suits you well if... |
|---|---|---|---|---|
| PURIZE | Coconut shell activated carbon, ceramic caps | XTRA Slim ø 5.9 mm in box, bag, and jar | ø 5.4–5.9 mm | you are looking for a slim all-rounder in many pack sizes |
| GIZEH | Coconut shell activated carbon, heat-resistant ceramic caps | Slim ø 6.0 mm in pink and rainbow, sets with papers | ø 6.0–7.0 mm | you want papers and filters from one source or colored filters |
| OCB | Coal-based activated carbon, heat-resistant ceramic caps | Slim Plus ø 7.0 mm as 10x and 50x | – | you roll slightly wider joints or prefer coal-based carbon |
Detailed brand guides:
Box, bag, or jar: What's worth it?
The packaging determines whether a filter is intended more for on-the-go use or for stock, and what an individual filter costs you.
- Box (10x to 50x): compact, good for testing and for your pocket.
- Bag (33x to 250x): resealable, lightweight, from an everyday bag to a bulk pack.
- Jar (42x to 100x): sturdy, reusable, ideal as a supply at home.
Price per filter at Skunaby (as of 14 Oct 2026)
| Product | Format | Pack | Price | per filter |
|---|---|---|---|---|
| PURIZE Activated Carbon Filter | XTRA Slim ø 5.9 mm | 10x Box | €2.00 | €0.20 |
| PURIZE Color Mix | XTRA Slim ø 5.9 mm | 33x Bag | €6.00 | €0.18 |
| PURIZE Rainbow | XTRA Slim ø 5.9 mm | 50x Bag | €8.00 | €0.16 |
| PURIZE Rainbow Bulk Pack | XTRA Slim ø 5.9 mm | 250x Bag | €35.00 | €0.14 |
| PURIZE Colored | XTRA Slim ø 5.9 mm | 100x Jar | €17.00 | €0.17 |
| PURIZE Conical | conical ø 5.4–5.9 mm | 42x Jar | €9.00 | €0.21 |
| GIZEH Pink | Slim ø 6.0 mm | 50x Bag | €8.00 | €0.16 |
| GIZEH All Pink | Slim ø 6.0 mm | 34x Box | €6.00 | €0.18 |
| GIZEH Conical | conical ø 6.0–7.0 mm | 10x Box | €3.00 | €0.30 |
| OCB Premium | Slim Plus ø 7.0 mm | 10x Box | €3.00 | €0.30 |
| OCB Premium | Slim Plus ø 7.0 mm | 50x Box | €8.00 | €0.16 |
Prices as of 14 Oct 2026, subject to change. You can always find the current price on the product page.
Our tip: Test first with a small box. Once you have found your filter and roll regularly, the PURIZE Rainbow bulk pack with 250 filters is the classic bulk purchase: at €0.14 per filter, it is our cheapest option per piece.
Common mistakes & myths
- Mistake: wrong size. An 8 mm filter will overstretch a King Size Slim paper; a 5 mm filter will slip out of a wide joint. Choose the paper first, then the filter.
- Mistake: filter stored open. Activated carbon absorbs moisture. Filters left out in the open draw poorly and can clump together. Always close the package.
- Mistake: packed too tightly directly in front of the filter. If the material at the mouthpiece is highly compressed, the draw resistance increases. Better to fill loosely there.
- Mistake: conical filter inserted the wrong way around. The wide end belongs to the mouthpiece, the narrow end points into the joint.
- Myth: "Smoking is harmless with an activated carbon filter." Not true. A filter changes the draw and smoking sensation; smoking remains harmful to health.
- Myth: "More expensive is always better." The deciding factor is the fit for your setup. With us, the price per filter is between €0.14 and €0.30 depending on the pack (as of 14 Oct 2026).
- Myth: "If it is hard to draw, the filter is to blame." Often, damp material or packing too tightly are the cause.
Which filter suits you?
To try out
You want to test activated carbon filters first. Start with a 10-pack box, for example PURIZE (ø 5.9 mm) or OCB Premium (ø 7.0 mm). This way you will quickly notice whether you prefer the slimmer or the wider filter.
For stocking up
You know what you like and don't want to keep reordering. Grab the PURIZE Rainbow bulk pack (250x), the 50-count bag, or the jar. The larger the pack, the lower the price per filter.
For cone joints
You prefer a classic conical roll. Try PURIZE Conical in a jar or GIZEH Conical in a box.
All-in-one
You want to buy papers and filters together. GIZEH sets combine 34 King Size Slim papers (107 × 44 mm) with 16 activated carbon filters (ø 6.0 mm) in a pack with a magnetic closure. View Papers + Filter sets
For an overview of what other accessories you really need, check out Stoner accessories: What do you really need?
Conclusion: Which activated carbon filters are the best?
The best activated carbon filters are the ones that suit your paper, your joint shape, and your usage. For most King Size Slim setups, a 6 mm filter is a safe starting point, such as the PURIZE XTRA Slim or GIZEH Slim. Those who prefer a wider roll should go for the 7 mm OCB Premium. Conical filters are worth it for cone joints, and those who roll regularly save money per filter with the 250-count bulk pack, 50-count bags, or jars.
Our advice: test in small quantities, then buy in bulk.
Frequently asked questions about activated carbon filters
Which activated carbon filters are best for joints?
The ones with a diameter that fits your paper and that provide an even draw. For King Size Slim, 6 mm filters like PURIZE XTRA Slim (ø 5.9 mm) or GIZEH Slim (ø 6.0 mm) are the most common standard.
What size do I need for King Size Slim papers?
Usually a Slim or XTRA Slim filter with a diameter of about 6 mm. For wider joints, 7 mm filters like the OCB Premium are suitable; for very wide joints or paper rolls, 8 mm filters; and for very large joints, Big-Size filters up to 10 mm.
What is the difference between straight and conical activated carbon filters?
Straight filters have the same diameter throughout. Conical filters taper towards one end, making them fit more securely in cone-shaped joints.
What kind of activated carbon is in PURIZE, GIZEH, and OCB filters?
PURIZE and GIZEH use activated carbon made from coconut shells, while OCB uses activated carbon from coal for its standard filters. All three use ceramic caps.
Why do activated carbon filters get clogged?
Common causes include moist material, packing too tightly directly in front of the filter, or storing filters in the open where they have absorbed moisture.
Is it worth buying activated carbon filters in bulk?
Yes, once you've found your preferred filter. At Skunaby, a single filter in the PURIZE Rainbow bulk pack (250x) costs €0.14, €0.16 in the 50-pack, and €0.20 to €0.30 in the 10-box (as of 14 Oct 2026). Store your stock in a dry, sealed container.
Are activated carbon filters healthier?
We do not make any health claims regarding this. Activated carbon filters change the draw and the smoking sensation, but smoking remains harmful to health.