Ash Catchers & Percolators Explained: Do You Need One for Your Bong?

If you've shopped for a bong in New Zealand, you've probably seen terms like "percolator," "ash catcher," and "diffused downstem" thrown around without much explanation. These parts aren't just marketing buzzwords — they change how smooth your sessions are and how often you need to clean your glass. Here's what each one actually does, and whether it's worth adding to your setup.

What Is a Percolator, Really?

A percolator is a secondary chamber built into (or attached to) a bong or waterpipe that breaks smoke into smaller bubbles before it reaches your mouth. More bubbles means more surface area in contact with the water, which cools the smoke down and filters out some of the heavier particulate. The result is a noticeably smoother pull, especially on bigger hits.

Common percolator styles you'll see on glass waterpipes include honeycomb discs, tree percs with multiple arms, showerhead percs, and simple inline percs. More percs generally means smoother smoke, but it also means more surface area to clean and slightly more drag when you inhale. A single well-designed percolator is often more practical for everyday use than a piece with four or five.

What Does an Ash Catcher Do?

An ash catcher is a removable attachment that sits between your bowl and your bong's downstem. Instead of ash, resin, and loose material falling straight into your main chamber, it collects in the ash catcher first — which is much easier to empty and rinse out than the body of your bong.

The main benefit is maintenance: your primary waterpipe stays cleaner for longer, and when gunk does build up, you're cleaning a small, often inexpensive attachment rather than scrubbing out your whole piece. Many ash catchers also include their own mini percolator, giving you an extra stage of filtration on top of whatever's already built into your bong.

The trade-off is height and fragility. Adding an ash catcher makes your setup taller and adds another glass joint that can get knocked or dropped. If you've got a smaller or more delicate piece, measure the joint size carefully before buying one — they're sized to match standard 14mm or 18mm joints, so double-check what your bong takes.

Downstems: The Part Most People Overlook

The downstem is the tube that carries smoke from your bowl down into the water. A diffused downstem has small slits or holes cut into the end, which breaks up the smoke as it enters the water — essentially acting as a basic percolator even on simpler pieces. If your current bong just has a plain, open-ended downstem, swapping it for a diffused one is one of the cheapest upgrades you can make for smoother hits.

Do You Actually Need One?

Here's the honest answer: no single accessory is essential, but each solves a specific problem.

• Want smoother hits on a basic bong? Start with a diffused downstem before anything else — it's the simplest, cheapest change.
• Tired of cleaning resin out of your main chamber? An ash catcher will save you time and keep your bong looking newer for longer.
• Already have a multi-perc piece and love big rips? You probably don't need to add more filtration — focus on keeping it clean instead, since buildup affects performance more than perc count does.
• Shopping for your first serious piece? A premium waterpipe with one well-placed percolator already built in is usually a better starting point than a basic bong plus several add-ons.

Keeping Percs and Ash Catchers Clean

Percolators and ash catchers have more nooks for resin to build up in than a plain tube, so they need slightly more attention. A rinse with isopropyl alcohol and coarse salt after each session (or at least weekly with regular use) keeps the arms and holes from clogging. If you want the full rundown on technique, see our guide on how to clean a bong in five minutes. Browse our range of cleaning products built specifically for glass.

FAQ

Do percolators really make a difference, or is it just marketing?

They make a real, measurable difference to how smooth the smoke feels — more bubbling surface area means more cooling and filtration. The effect is noticeable going from zero percs to one, but the gains shrink with each additional perc you add, so an elaborate eight-arm tree isn't dramatically smoother than a well-made single honeycomb perc.

Will an ash catcher fit any bong?

Only if the joint size and angle match. Most New Zealand bongs use a standard 14mm or 18mm female or male joint at a 90-degree or 45-degree angle. Check your bong's joint size before buying, and if you're not sure, our team can help — reach out via the contact page.

Does adding a percolator or ash catcher make a bong harder to pull through?

Slightly, yes. Every extra chamber adds a small amount of drag. Most people don't notice it with one or two percs, but if you're finding a heavily percolated piece hard to clear, that's normal and not a fault with the piece.

Can I add a percolator to a bong that doesn't already have one?

You can't retrofit a built-in percolator into solid glass, but you can get a similar effect by adding a diffused downstem or an ash catcher with its own percolator — both attach externally without modifying your existing piece.

What's the easiest upgrade for someone on a budget?

A diffused downstem. It's the lowest-cost way to add filtration to a basic bong, and it's a simple swap that takes seconds.

Ready to upgrade your setup? Shop our full range of glass waterpipes, ash catchers, and bong accessories — all shipped discreetly, NZ-wide.