Percs, short for percolators, are small internal filters inside a bong that break smoke into tiny bubbles as it passes through water. Each bubble cools and smooths the smoke before it reaches your lungs. Percs come in many shapes, including tree, honeycomb, showerhead, and matrix designs, but every type does the same basic job: a cooler, gentler hit.
If you have been shopping for a bong, you have seen the word perc on almost every product page. Honeycomb perc, tree perc, double perc. I will walk you through what each type does, how they compare, and whether you actually need one.
Where Does the Percolator Sit in a Bong?
The percolator sits inside the bong's main chamber or lower neck, positioned so smoke passes through water at its slits or holes. Most percs are blown from borosilicate glass, the same heat-resistant material used for the rest of a quality bong, and are fused in place during manufacturing.
A perc is not the same as a bowl or a downstem. The bowl holds your dry herb. The downstem carries smoke down into the water. The perc is the extra filter that splits that smoke into bubbles. A slitted downstem counts as the simplest perc, which is why many basic bongs already include one.
What Are Percs Used For?
Percs are used for three things: cooling smoke, softening harshness, and reducing splashback. Water contact pulls heat out of the smoke, so each pull feels less scratchy on your throat. The bubbling action also traps some stray ash before it reaches your mouth.
There is one trade-off to know. Every perc adds a little drag, which means you pull slightly harder to clear the chamber. Well-designed percs keep that drag low.
How Do Bong Percolators Work?
Bong percolators work by splitting one large stream of smoke into dozens of small bubbles. Smaller bubbles mean more of the smoke touches the water, so heat transfers out faster. Percs increase the surface area of smoke in contact with water by 150 to 300%, depending on the type.
The design details change from perc to perc. Slits, holes, arms, and discs all create bubbles in different patterns. The physics stays the same: more bubbles, more water contact, cooler smoke.
7 Common Percolator Types
There are 7 percolator types you will see most often: diffused downstem, tree, showerhead, honeycomb, matrix, coil, and turbine. Each one filters smoke the same basic way but differs in shape, drag, and cleaning effort.
Diffused Downstem Perc
A diffused downstem is the simplest perc: a straight tube with slits cut into the base that sit under the water. It comes fixed or removable. Removable diffused downstems are the easiest perc to swap or upgrade, which makes them a smart first choice for beginners.
Tree Perc
A tree perc groups several vertical arms together, each with slits at the bottom. More arms create more bubbles. Tree percs are a classic pick because they filter well and stay simple to clean. The arms can be fragile on thin glass, so handle taller pieces with care.
Showerhead Perc
A showerhead perc is a vertical tube that flares into a rounded base ringed with slits or holes. Smoke sprays out in all directions, like water from a showerhead. It balances smooth filtration with low drag, and the open shape rinses out easily. This is the most practical pick for a first perc bong.
Honeycomb Perc
A honeycomb perc is a flat glass disc packed with dozens of tiny holes. It sits parallel to the base and shoots bubbles straight up. Honeycombs look great and stack well, so many bongs run two or three levels. The catch: those tiny holes clog fast and take real effort to clean.
Matrix Perc
A matrix perc is a barrel-shaped filter with both vertical and horizontal slits arranged in a grid. It produces a dense wall of bubbles and doubles as a showpiece in the center of the chamber. A stereo matrix stacks two of these barrels for extra diffusion.
Coil and Spiral Percs
A coil perc routes smoke or water through a spiral glass path, stretching the distance smoke travels before you inhale. Glycerin coils take this further. You freeze the detachable coil, and the chilled glycerin cools each hit far below room temperature without watering anything down.
Turbine and Other Percs
A turbine perc uses angled slits that spin the water into a small whirlpool while filtering. Beyond that, you will run into inline percs (horizontal slitted tubes), UFO percs (slitted domes), and ratchet percs (discs with edge holes). These are variations on the same bubble-making idea, not different technology.
Percolator Comparison Table
The table below compares the five most popular percolator types on cleaning effort, smoothness, and best use case.
|
Perc Type |
Cleaning |
Smoothness |
Best For |
|
Diffused downstem |
Easy |
Good |
First bong, simple setups |
|
Tree |
Easy |
Very good |
Everyday practical use |
|
Showerhead |
Easy |
Very good |
Beginners wanting an upgrade |
|
Honeycomb |
Hard |
Excellent |
Looks and maximum diffusion |
|
Matrix |
Medium |
Very good |
Centerpiece glass |
The takeaway is simple: showerhead and tree percs give you most of the smoothness with the least maintenance, while honeycombs trade easy cleaning for looks and power.
Single Perc vs Multiple Percs
A single perc delivers most of the benefit, while extra percs add smaller gains with more drag. Multi-perc bongs cool smoke 15 to 25°F more than single-perc pieces, so the difference is real. Whether it matters to you is personal.
Stacked percs also mute flavor slightly and take longer to clean. A good approach is to start with one perc and add filtration later if you want it. An ash catcher lets you bolt extra filtration onto the bong you already own instead of buying a new piece.
Do You Actually Need a Perc?
No, you do not need a perc to enjoy a bong. Plain straight tube and beaker bongs hit great with nothing but water, and plenty of adult smokers prefer that direct pull. A perc is a comfort upgrade, not a requirement.
Percs are popular for a reason, though. Between 55 and 60% of bongs sold include at least one percolator. If harsh hits are your main complaint, a perc solves that problem better than any other feature. Height and joint size matter just as much as filtration, and this bong size guide for beginners explains how to match all three.
How to Keep a Perc Clean
To keep a perc working, clean it before residue builds up inside the slits. Follow these four steps:
- Empty the water after every session so residue never sits overnight.
- Pour in 91% or stronger isopropyl alcohol with coarse salt.
- Shake gently for two to three minutes, letting the salt scrub the glass.
- Rinse twice with warm water and let the piece air dry.
Honeycomb and other small-hole percs need this routine more often than open designs. For stubborn buildup deep inside multi-perc pieces, cleaning supplies made for glass reach the spots salt and alcohol miss.
FAQ
Do percs make a real difference?
Yes, percs make a real difference. A perc breaks smoke into small bubbles, and each bubble sheds heat into the water, so hits land cooler and gentler on your throat. How much you notice depends on your sensitivity. Some adult smokers feel the change instantly, while others prefer the direct pull of a plain tube.
Do I need a perc?
No, you do not need a perc. A basic straight tube or beaker filters smoke through water on its own and hits fine without extra parts. A perc is a comfort upgrade rather than a requirement. Many beginners start with a simple piece and add filtration later once they know their preferences.
Which perc is best for beginners?
A showerhead or tree perc is best for beginners. Both designs filter smoke well, keep drag low, and rinse clean with alcohol and salt in minutes. Skip honeycomb percs for a first piece. Their tiny holes clog quickly and demand more maintenance than most new owners want to keep up with.
Are more percs always better?
No, more percs are not always better. Extra percs add smoothness, but each one also adds drag, slightly mutes flavor, and stretches out cleaning time. A single well-made perc delivers most of the benefit. Start with one, then move to a double or triple perc later if you want more filtration.
What are perc 30s?
Perc 30s is street slang for a prescription pill and has nothing to do with smoking accessories. In a smoke shop, a perc always means a bong percolator, the internal glass filter covered in this guide. If you searched for the pill, this article covers water pipe filtration instead.
Find the Right Percolator Bong
A perc is a small glass filter that turns harsh smoke into cool, easy hits, and the right type comes down to how much cleaning you will tolerate. The full range of percolator bongs at DankStop covers every design in this guide, from simple showerheads to stacked honeycombs, and a free Cabana Club account unlocks member perks at checkout.
