If you smoke or vape through a bong most days, dump the water after every session and do a full alcohol and salt wash every two to three days. Occasional users can stretch a full clean to once a week, as long as the water gets replaced each time. That is the short answer. The longer one depends on how much resin your piece collects, how big the chamber is, and whether you leave standing water sitting in it between sessions.
Why there is no single number
Resin is sticky and it traps everything. Every hit pulls smoke through water, and that water holds ash, plant matter, and whatever microbes were already in the pipe. A big beaker with a percolator has more surface area to coat, so it fouls faster than a small straight tube. Someone who takes two hits on a Friday can go a week between washes. Someone packing bowls all day will watch the water turn brown by evening.
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Water is the daily part
Dump it, rinse the chamber, refill with fresh water. This takes under a minute and it matters more than most people assume. Standing water sits at room temperature, and warm, nutrient-rich water is a decent place for bacteria and mold to grow. Fresh water also keeps the taste clean. Old water tastes the way an ashtray smells.
Full clean: the two to three day rule
Daily or near-daily use builds resin on the downstem, bowl, and inner walls. Once you can see brown streaks or the glass feels tacky, you are past due. A full wash with isopropyl alcohol and coarse salt takes five to ten minutes.
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- Empty the water and pull out the downstem and bowl.
- Pour 91% isopropyl alcohol and a spoonful of coarse salt into the chamber.
- Cover the openings and shake for a minute or two. Salt scrubs, alcohol dissolves.
- Rinse with hot water until no alcohol smell remains.
- Soak the bowl and downstem in a small bag or jar of alcohol while you work.
Signs you waited too long
- The water smells sour or looks cloudy.
- Hits taste harsh, burnt, or metallic.
- Resin clogs the downstem and you have to pull harder.
- Black specks float up after a hit.
- Mold spots, which show up as white or green fuzz on the glass.
Convenience changed the math
The old routine was a chore, so people skipped it. Now the market sells shortcuts. Silicone pieces go in the dishwasher. Ash catchers and reclaimers catch the worst of the resin before it reaches the main chamber, so you clean one small part instead of the whole pipe. Reusable cleaning caps let you shake a bong without plugging holes with your palms. Some shops sell pre-cleaned glass. None of that removes the need to clean, but it cuts the job down to a couple of minutes, and that is the difference between a piece that gets washed and one that does not.
If you want a rule that holds up: fresh water every session, full clean every two to three days for heavy use, once a week for light use, and right away if you spot mold.