Fill your bong until the bottom of the downstem, where the slits or holes are, sits about half an inch to an inch under the water. Then take a slow dry pull before you light anything. It should bubble easily, without water splashing up the neck. That's the right amount.
That rule works for almost every bong. Here's how to check it, what goes wrong when you're off, and how to adjust for percolators, ice catchers and gravity bongs.
Why the Water Level Matters
The water is what cools and filters your smoke. The smoke comes out the bottom of the downstem, bubbles up through the water, and collects in the tube. If the downstem isn't under water, the smoke never gets cooled. If it's too far under, you're pulling against a column of water. More on what the water actually does in why there's water in a bong.
| What You Notice | What's Wrong | Fix |
|---|---|---|
| Harsh, hot hits | Too little water. Downstem barely covered | Add water until the slits are fully under |
| Barely any bubbles | Too little water | Add a little more |
| Hard to pull | Too much water, or a clogged downstem | Pour some out. If that doesn't fix it, clean the downstem |
| Water splashes into your mouth | Too much water | Pour some out and pull slower |
| Loud gurgling | Usually too much water | Pour a little out |
How to Fill a Bong, Step by Step
- Start with a clean bong. Old water and resin make everything taste worse.
- Use cold water. Cold water cools smoke better than warm. Tap water is fine.
- Pour through the mouthpiece, or remove the downstem and pour through the joint. Pouring through the joint makes it easier to see the level.
- Fill until the downstem tip is about half an inch to an inch under. Put the downstem back in and check.
- Take a dry pull. No herb, no lighter. Just pull gently and listen. A smooth, steady bubble is what you want.
- Adjust. Too hard to pull or water jumping up? Pour some out. Barely bubbling? Add a splash.
For the rest of the process, from packing to clearing, see our guide on how to use a bong.
Adjusting for Different Bongs
Beaker and Straight Tube Bongs
The basic rule applies. Downstem tip half an inch to an inch under. Beakers hold more water because of the wide base, but don't fill past the rule just because there's room.
Percolator Bongs
Fill the main chamber using the same rule. Then make sure the percolator's slits are just covered. Overfilling a perc is the most common cause of splashback, so start low and add a little at a time. Here's how percolator bongs work.
Bongs With Ice Catchers
The ice sits in the neck, not in the water, so the fill rule doesn't change. Just remember that ice melts and drips down. Check your water level during longer sessions and pour a little out if it creeps up.
Small Bongs and Bubblers
Less space means less water. A little goes a long way. Start with less than you think and add from there.
Gravity Bongs
Different system entirely. A gravity bong uses water to create suction, not to filter smoke. Follow the maker's fill line. More on how they work in our NWTN gravity bong comparison.
The Capsule Water Pipe
On a Capsule, fill to just above the silicone base. That puts the downstem right where it needs to be. The base also hides the water, so nobody's looking at yesterday's bong water on your table.
Does More Water Make It Smoother?
Up to a point. Going from too little to the right amount makes a big difference. Going past that doesn't make it any smoother. It just makes the pull harder and the splashback more likely.
What actually makes hits smoother: cold water, clean water, a little ice if your bong has a catcher, and pulling slowly.
How Often to Change It
Every day you use it, at minimum. Ideally after every session. Old bong water gets cloudy, smells awful, and makes hits taste stale. Here's how often to change your bong water, and if you ever spill it, here's how to get rid of bong water smell.
Still Not Pulling Right?
If the water level is right and it still feels off, the problem is probably somewhere else:
- Clogged downstem or bowl. Resin builds up and blocks airflow. Give them a soak. Our bong cleaner guide covers what works.
- Air leak at the joint. A loose or chipped bowl lets air in and kills the pull. Check that your bowl is the right size. Here's our bowl size guide.
- Cracked downstem. Even a hairline crack lets air bypass the water. See parts of a bong for what to replace.
FAQ
How much water should be in a bong?
Enough to cover the bottom of the downstem by about half an inch to an inch. Do a dry pull to check that it bubbles easily without splashing.
Should the downstem touch the water?
Yes. The tip of the downstem has to be under the water. If it isn't, the smoke skips the water entirely and you lose the cooling.
What happens if you put too much water in a bong?
It gets harder to pull, and water can splash up into your mouth. Pour some out until a dry pull feels easy.
What happens if there's not enough water?
The smoke barely gets cooled, so hits come out hot and harsh.
Does ice water make bong hits smoother?
Cold water helps. Ice in the neck, if your bong has an ice catcher, helps more. Just watch the water level as it melts.
Can you use something other than water in a bong?
You can, but you probably shouldn't. Sugary or carbonated drinks get sticky fast and are hard to clean. We cover the details in why there's water in a bong.