A Bit (A Lot Actually) About Filters…

This is an article I found somewhere over the summer and can’t now remember where (!), and although written by an American for an American audience I thought the educational elements were invaluable as a filter focused blog post… Please, enjoy and as always let me know your thoughts.

Pipe filters tend to get a bum rap in the USA – why is that when they are so widely accepted in Europe?

Numerous times, I’ve seen threads on US forums in which a beginner asks about the filter that came with a brand new or estate pipe, only to be told that they are categorically without merit, and should be tossed in the nearest bin. But how can this be? If they were so useless, why would major producers—companies like Missouri Meerschaum, Dunhill, Savinelli, Brigham, Carey’s to name a few—continue to make pipes chambered for a variety of filters? Americans are the rough and tumble sort, quick to eschew gimmicks and gadgetry in favor of pure performance, but surely there must be some segment of the populace that demands these devices, or the simple fact is that the market would no longer bare their production.

You might be surprised to see the sales figures of filter-capable pipes, both in the USA and elsewhere.

While people like us that partake in the online community and perhaps attend pipe shows or Club events (let’s call ourselves “advanced” users) may see ourselves as indicative of the overall industry, that’s not quite the whole picture. In truth, we’re but a tiny percentage of a miniscule industry when scaled against tobacco in general, though our ranks are growing again daily. The fact is, the vast majority of pipe smokers do not participate in online discussion groups, pipe shows or even pipe clubs; they’re mostly lone wolves who are content in their solitary enjoyments. And while some higher-end marques and carvers chamber their pipes for filters, the majority of filter pipes are in the more modest echelons of price. Ask any retailer or etailer, and the story is the same: bargain pipes outsell high grade and artisan pipes by a spectacular margin. While the greats are great for very good reason, I’m sure that Rad Davis, Paolo Becker or Tonni Nielsen would kill for the sales figures of Dr. Grabow.

So what are the benefits of filter pipes, and what are the drawbacks? Pipe filters are generally built around the concept of cooling the smoke and removing moisture as well as tar and other by-products of combustion. Moisture and combustion by-products are inescapable in pipe smoking, obviously, so why try to remove them? Moisture in part is what delivers the flavor of burning tobacco, so why would one wish to remove it from the smoke? One reason is that excessive moisture can actually detract from the smoking experience in a number of ways: by causing gurgle, or a buildup of condensed moisture that blocks the draft hole; by “spitting”, which occurs when the built up moisture enters the smoker’s mouth from the bit; and by exacerbating the effects of tongue burn from the hot steam. A number of engineering means have been employed to mitigate excessive moisture in the smoke stream, notably the design of gourd calabash pipes, Peterson system pipes, and newer incarnations such as the reverse calabash varieties, as innovated by the likes of Rolando Negoita. To some degree, all of these systems will remove an amount of combustion by-products as well, suspended in the collected moisture.

So let’s take a closer look at some of the mechanical methods used to filter pipe smoke: pass-through filters, which include paper, carbon and silica crystal cartridges; fibrous filters including wood and cotton; and “stingers”, or mechanical condensation baffles. I hope it will help dispel some myths about the reputation filters have particularly in the US, and perhaps help both beginners and advanced users better understand and appreciate their use and benefits. While this list is by no means exhaustive, it hopes to cover the prevalent types of filters available. Most opponents of filter use cite the increased resistance in the draw and the cleaning maintenance as the main shortcomings, which will be addressed on an individual basis.


The landmark Medico patent.

The most commonly encountered paper filters in the US are either Medico branded, or variations on their 1933 patent. The engineering is simple and effective for this pass-through style of filter: a paper tube (either 6mm or 9mm) with a number of perforated baffles on its interior, covered in a thin cellophane wrapper. As mentioned, many styles of Missouri Meerschaum Corncob pipes come standard with a Medico brand filter, as do Medico brand pipes, naturally. Able to be used over the course of several smokes before being disposed of, they’re also quite economical due to their simplicity.


Medico filters in the wild.

While there is obviously added turbulence and resistance to the air stream, the effect on the draw is actually minimal, and easily mitigated with minor adjustments to one’s technique and tobacco choice. I personally have a great fondness for a certain style of Medico pipe, and always enjoy them with their filter in place, finding that the draw without them is actually unbalanced. While the trope that “your mileage may vary” certainly applies, I find them best suited to particularly moist aromatic blends or flakes, serving to allow a great smoke while regulating the moisture content effectively. They’re also aces with tobacco that’s a bit crumbly and prone to flying into your mouth. Once you’ve adjusted to them, they’re well worth the effort. Again, I feel the slight airflow restriction to be wildly overblown in many discussions of the subject, and as a professional tobacco taster I can attest that there is no adverse effect on flavor when employed properly—e.g. not re-using filters, not using them past the point that they’re drenched with moisture and black with tar, et cetera. In other words, common sense should prevail in their use. There are also versions with activated carbon-infused paper in the baffles, which have similar overall characteristics. They require no special care, and actually make the pipe shank easier to clean.


The mechanics of cartridge filters.

The European market favors the 9mm cartridge filter. Similar in concept to the all-paper Medico style but arguably more effective, this type of filter employs either activated charcoal, meerschaum granules, or silica crystals wrapped in a paper cartridge and capped with plastic or ceramic ends. Working on the same principle of capillary action as the Medico style, they leech moisture from the smoke stream by adsorption, with the added benefit of chemically bonding to carbon-based impurities. The draw restriction tends to be more substantial with these types, owing to the limitation of the holes in the end caps, but again, proper technique and practice are really all that is required to obviate this hindrance. A good 9mm filter pipe will also have been designed to ensure that the draw restriction has been compensated.  Vauen and Denicotea are the major producers of this style, and most top European factory pipe brands offer pipes chambered for them —including EA Carey, Dunhill, Peterson and Savinelli, among others.


The mechanics of the “Magic Inch” system

The Carey Magic Inch is an interesting and singular take on absorptive filtration. At the tenon of a Magic Inch pipe there are perforations, as well as on the mortise of the stem side of the connection. Over these holes is placed the “papyrate” filter, a paper-like sleeve. During a smoke, the turbulence and temperature differential of the perforated airway condenses moisture, while the permeable sleeve allows cooler air in while evaporating collected moisture. There is no draw resistance; in fact, the draw without the sleeve is nearly impossible, while with the sleeve in place it is quite satisfactory. While the overall rate of moisture removal is small, it does function as advertised. I scoured a popular online auction site for a suitable pipe for this article and the smoke in it was good, and noticeably decreased in moisture albeit not a game changer. This is a non-restrictive system, allowing you to insert a pipe cleaner all the way through the stem to absorb excess moisture. EA Carey is the sole producer of this style of pipe and its filters. They do require frequent changing and a bit of cleaning around the “Magic Inch”.


The Carey “Magic Inch” pipe in action.



Balsa wood has long been known as a wonderful natural material for moisture absorption. An extremely lightweight and low-density wood, “balsa” in fact comes from the Spanish word for “raft”. Savinelli is the brand that is most associated with this style of in-line filter, offering both 6mm and 9mm sizes, and in both a triangular cross-section as well as a cloverleaf cross-section, although there are many other manufacturers of similar styles. The filter works by collecting moisture that condenses as it passes over the wood; balsa can surprisingly hold in the order of eighteen thousand times its weight in water. They also claim to absorb 77% of the nicotine and 91% of the tar from the smoke stream, as tested by independent laboratories. I personally love my Savinelli for aromatics that need just a little tempering, although it works equally well on any style of tobacco you choose. Another advantage of this style is that there is no appreciable restriction of draw, although like paper or cartridge filters you won’t be able to thread a pipe cleaner through the stem while smoking — though the use of the filter should obviate the need for such. In addition to balsa, there are similarly shaped versions available in natural cotton, displaying similar dehumidification properties.


One of my favorite pipes, particularly for taste testing aromatics.


A classic patent-era Brigham bulldog.

Brigham pipes have a unique take on the wood filtration system, employing a hollowed-out rock maple tube that is inserted in the stem. Similar to Dunhill’s innertube (patented!), it lines the stem and shank of the pipe. Like the balsa system, the wood is remarkably absorbent; here, though, there is no obstruction to the airflow from in-line turbulence. While the filter does reduce the draft hole, from approximately 5.75mm to 3mm, it does not impede the draw to uncomfortable levels, and will pass a pipe cleaner unimpeded. It’s a good system and remarkably effective at attenuating moisture. I also find them a handy choice for situations like pipe shows, when I may want to sample several blends but not carry a dozen pipes—simply swapping out a used filter for a new one once the pipe has cooled allows for a fairly unfettered taste of different blends. Brigham is the only producer of their filter system pipes.


Brigham’s system explained.

Another point to note with wood filters is that they are technically reusable. Once laden, the filters can be boiled in water to remove the oils collected, then dried and redeployed. I’ve tried this with both the balsa and maple Brigham styles, and find that it’s a lot of work just to save a few pennies, and doesn’t satisfactorily remove the odor of its first use. At their modest price points I prefer to use them once and dispose of them, considering it a minor investment for a small portion of my collection.


A collection of stingers

Few words in the lexicon of pipedom inspire as much fear and loathing as the dreaded “stinger”. Few topics engender such divisive opinions, with one camp advocating circumcision as the only sane choice, while the other meekly defends keeping them in the name of original integrity. If we can step back calmly from that brink to examine the concept, we can also hopefully diffuse some of the misconceptions and bad reputation stingers have.


Aspida, conceived by Kostas Gourvelos.

Stingers, though varying widely in design from pipe to pipe, all work on the same principle. By introducing turbulence to the smoke stream with a material that remains at a lower temperature than the smoke, moisture is removed through condensation and, ideally, directed away from the air passage. Hundreds of variations on this design have been employed throughout the years, perhaps most notably by the Kaywoodie brand. The big drawback with stingers is generally that they work against themselves — they condense moisture out of the smoke really well, but that in turn tends to clog the reduced air passages in the device itself. There are work-arounds to this, such as unscrewing the tenon to wipe the stinger clean—you’re definitely not going to be able to thread a pipe cleaner through most styles. They also need more meticulous cleaning than other pipes to keep them looking good.


Kaywoodie SuperGrain, Genod Playboy, and CB Weber pipes, all with stingers intact; the Weber actually provides three interchangeable options.

While I do smoke several pipes with their stingers intact, I must always give myself a pre-smoke coaching: ”I will smoke as slowly as humanly possible; no, even slower than that, and I WILL NOT gurgle.” Much of the time this little serenity prayer works…but not always. Stingers are also good at preventing debris from flying up into your mouth, but are conversely easily clogged by said debris. They’re definitely an acquired skill, but once you have mastered their technique you will be the envy of everyone in your local pipe club.


Dunhill and Genod inner tubes.

The Dunhill innertube (patented!) is technically not really a filter, but it does act as a condensing chamber. I personally find them adequate for keeping the shank and stem clean, as they prevent the oils and tars from soaking in there. They also do not inhibit the draw, and allow a cleaner all the way through to the heel.

Another type of filter that warrants its own category is the meerschaum or chalk clay button, which is placed at the bottom of the chamber below the tobacco and in front of the draft hole. The upside of this type of device is that it can be used in any pipe, is easily re-used, and utterly unnoticeable in the smoking mechanic. “Philtpad” is a classic brand that still produces them, and vintage examples can be found without too much trouble at antique shops and auction sites. Clay buttons can be boiled or re-fired clean; meer, not so much. Meerschaum granules are also available. I use mine religiously in a particular few pipes, deep-chambered bents with narrow drafts. I rarely smoked these pipes because of their proclivity to percolate like a coffee pot, until I discovered the buttons in an estate lot I’d purchased. Now they’re my go-to pipes for moist, rich flakes.


One of the least intrusive types of filtration.

We filter the oil in our cars, the water from our taps, and the air in our living rooms; why then so much disdain for pipe filters? It would be a disservice to your own education as a pipe smoker not to at least try some of the various types of filters available, in order to weigh the pros and cons for yourself. If you find that you don’t like them at all—not in a box, not with a fox, not in a house, not with a mouse—they’re generally easy enough to dispense with, as there are adapters that will retrofit a filter-chambered pipe down to a “normal” draft hole size (which size that may be is another topic of heated debate in the pipe world). The next time you pick up an MM cob, keep the filter and remember to adjust your cadence; smoke slowly but continually, and draw lightly—you may just be rewarded. I for one enjoy them in their various flavors, as noted in all the images of well-used pipes from my own collection, and I’m interested to read your take on them in the comments section below.

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10 Responses to A Bit (A Lot Actually) About Filters…

  1. avatar Robin says:

    Great info. Thank you. Regrettably I bought the White Elephant Charcoal filters. 6mm. I’ve got other 6mm filters and they fit my corn-cob pipe easily. The WE ones have to be pushed in hard and then when finished they are wet and break and have to prised out with the skill of a neuro surgeon and the determination of a plumber.

    I”m going to the hobby shop, buy some 8mm ply lengths. Drill a hole through a piece of half inch steel and bash the 8mm lengths through them until my hearts content!!! Because I can’t find any round 6mm balsa filters anywhere.

  2. avatar Manuel Pintado says:

    Excellent article. Clear explanations with respective examples. I only use in my pipes the Vauen or Peterson 9MM filters.

    • avatar Marcus says:

      Thanks for the comment and I’m pleased you enjoyed the read, but why no Carey 9mm filters in your pipes?! They’re made in the same factory as the 2 brands you mention…

  3. avatar jerry says:

    Marcus,

    Which is better for removing gunk? The magic inch or 9mm filter?

    • avatar Marcus says:

      Hi Jerry. Phew, good question! Without wanting to sound evasive I’m not sure there is a straightforward ‘a or b’ type answer for this one. Both systems work well for removing unwanted gunk from pipe smoke, so I think it really comes down to personal preference. I would (and do) gladly recommend either…

    • avatar jerry says:

      Thanks. I thought the magic inch was designed to remove moisture as opposed to gunk per se?

    • avatar Marcus says:

      You are right Jerry but in effect by mixing the smoke with cool air thus allowing the moisture to condense, the ‘gunk’ being carried by the smoke is also partly removed. The evidence for this is in the fact that the sleeves are stained during the smoking process, much like the charcoal in the 9mm filters. Different system, different effect on the smoking experience, but same result give or take.

  4. avatar Butch says:

    Interesting. Like most smokers with a small collection of pipes, I have some with and some without. I find I prefer some tobaccos through a filter. And perhaps oddly, I like a bit of resistance on the draw anyway.

    And pictures accompanying this article actually revealed that I could try Medicos with one of my estate pipes and a plastic Yello-Bole I had picked up for amusement.

  5. avatar Andy Minshull says:

    Really excellent article. I have a mix of filtered and non-filtered pipes and don’t think that filters make much difference to the way that they smoke but they sure absorb a lot of gunk.

    • avatar Marcus says:

      My thoughts exactly Andy. If you get 90% of the flavour but only 50% of the gunk it’s a good trade off in my mind!

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