What Are Percs? Every Bong Percolator Type Explained
Percs are percolators — the internal glass chambers in a bong that force smoke through water, breaking it into thousands of tiny bubbles so every hit comes out cooler and smoother. If a bong is described as having a tree perc, honeycomb perc, or UFO perc, that's the filtration system doing the work between the bowl and your lungs. This guide explains how percolation actually works, walks through every major perc type with its real strengths and weaknesses, and finishes with honest advice on how many percs you actually need — because the answer isn't "as many as possible."
What Does a Perc Actually Do?
Every time smoke passes through water it cools down and drops some of its harshness — water absorbs heat and captures a portion of the water-soluble irritants and particulate riding along with the smoke. A percolator multiplies that effect through simple physics: surface area. One big glug of smoke touching water cools a little; the same smoke shredded into thousands of fine bubbles exposes vastly more of itself to the water and cools a lot. Every perc design in glass — however exotic it looks — is just a different strategy for making smaller bubbles.
Worth knowing: the humble diffused downstem in a basic beaker is technically the first perc. Its slits break the smoke stream before it enters the water. Everything below is what glassmakers add on top of that foundation — and why a bong with a quality downstem already hits noticeably smoother than one with an open tube. We compare slitted and open stems in diffused downstem vs regular.
Does filtration cost you potency? Barely. Cannabinoids aren't water-soluble, so the water mostly captures heat, ash and irritants rather than the compounds you're after. The resin that builds up on glass over time is largely material that would never have absorbed anyway. The trade heavily favors filtration — which is why virtually all high-end flower glass is percolated.
Every Perc Type, Explained
Tree Perc
A cluster of vertical arms — usually 4 to 12 — descending from a central stem like an upside-down tree, each arm slitted at the bottom. Smoke splits between the arms and diffuses from every slit simultaneously. More arms mean more diffusion, and a well-made tree delivers some of the smoothest hits in glass. The trade-offs: slightly more drag than simpler designs, more careful cleaning (resin hides in the arms), and fragility — those arms are the most delicate structure in any piece, which is why thick-walled construction matters double on tree builds. Our 21" Triple Hitter stacks three tree-perc chambers in 9mm glass — the maximalist version of the concept.
Honeycomb Perc
A flat glass disc drilled with dozens of small holes, mounted horizontally across the tube. Smoke has no choice but to split through every hole at once, producing a wall of uniform fine bubbles with almost zero added drag — the best diffusion-to-effort ratio in glass. Honeycombs also stack beautifully; double and triple honeycomb tubes are popular precisely because each disc adds smoothness without adding meaningful pull resistance. Cleaning is easy since there are no interior pockets. If you're adding one perc to your life, this is the default recommendation. See how it compares against the classic in our tree vs honeycomb breakdown.
Showerhead Perc
A dome with slits around its bottom rim, shaped exactly like its namesake. Smoke flows down through the center and radiates out through the slits in an even ring of bubbles. Great all-rounder: solid diffusion, low drag, easy cleaning, visually satisfying. Common in dab rigs as well as bongs because it performs well at small scale.
Matrix Perc
A cylinder with slits cut in a grid — vertical and horizontal — firing bubbles in every direction at once. Among the best-looking percs in operation and a genuinely strong performer, with drag between a honeycomb and a tree. The grid pattern resists clogging better than tree arms but still rewards regular cleaning.
Inline Perc
A horizontal slitted tube, usually mounted in the base, often feeding a second perc above it. Big bubbles, low drag, and structurally the sturdiest perc design — nothing dangles. A favorite foundation stage in double-perc builds.
Disc / Puck Perc
A simple slitted or fritted disc across the tube. Modest diffusion, minimal drag, hard to break, cheap to make — usually a supporting act in multi-perc pieces, and also a handy splash barrier.
UFO Perc — Our Signature
A rounded, saucer-shaped chamber that bulges out of the tube, giving smoke a wider space to expand into with more water contact than a standard disc manages. The result is a big, soft hit with surprisingly little drag — and yes, it looks like a flying saucer parked in your bong, which is very much on brand for a company named Alien Flower Monkey. You'll find the UFO perc across our Alien Bongs collection in beakers and straight tubes, and it's the signature we're known for.
Which Perc Is the Smoothest?
For pure smoothness, tree and matrix lead. For smoothness with the least drag, honeycomb and showerhead win. For character and big-hit comfort, the UFO is why people come to us. But the honest ranking insight is this: any well-made perc beats no perc by a wide margin, and the differences between good perc types are smaller than the difference between thin and thick glass. Choose the piece; let the perc come with it.
Do More Percs Mean Smoother Hits?
Up to a point, yes — then physics sends the bill. Each stage adds smoothness and drag, and each stage's improvement is smaller than the last. One good perc captures most of the available benefit; two or three well-designed stages is the enthusiast sweet spot; beyond that you're pulling hard for marginal gains, managing water levels across four chambers, and signing up for serious cleaning sessions. Glass marketing loves perc counts; your lungs prefer perc quality.
Living With Percs: Water and Cleaning
Two practical notes that decide whether you love or resent a perc piece. Water levels: each perc needs just enough water to cover its slits or holes — typically achieved by pulling water up through the piece after filling the base. Overfilled percs add drag and splash; dry percs do nothing. Our guide to using a bong covers filling and water levels. Cleaning: a clogged perc is worse than no perc — stale resin in the diffusion slits means drag plus bad flavor on every hit. Salt and isopropyl handle every design; trees just need longer soaks and more patient shaking. Clean after heavy weekends rather than quarterly and any perc stays a joy. Full method in our bong cleaning guide, with supplies here.
Perc FAQ
What's the best perc bong to start with?
A beaker with a single honeycomb or showerhead — a clear smoothness upgrade with no meaningful downside. Browse the percolator collection or the lab-style builds in scientific glass.
How much water does a percolator bong need?
Enough to cover the slits or holes of each perc and no more — usually about an inch in the main chamber, then a splash in each stage above it. Fill the base first, then pull gently through the mouthpiece to draw water up into the higher chambers. Overfilling adds drag and splash-back; leaving a perc dry wastes it entirely.
Can I add a perc to a bong I already own?
Effectively yes — an ash catcher is a bolt-on external perc that fits your existing joint, adding a full diffusion stage plus ash trapping without buying new glass. The quiet cheat code of the category.
Do percs work for dabs too?
Absolutely — concentrate rigs use the same physics at smaller scale, with showerhead and recycler designs dominating because they preserve flavor while cooling.
Why is my perc bong suddenly harsh?
Dirty water or clogged slits, almost always. Fresh water every session or two, and a proper clean when bubbles stop looking fine and uniform.
Is the UFO perc really different from a disc perc?
Yes — the saucer bulge widens the chamber at the diffusion point, so smoke spreads laterally through more water instead of punching straight through. More contact, softer hit, same easy pull. It's why we build our signature line around it.
