What Type of Smoke Is Used for Plumbing Smoke Testing?
Plumbing smoke testing typically uses either smoke generated by smoke bombs or candles, or dense fog produced by a water-based fog fluid and a professional smoke testing machine. Water-based high-density fog is increasingly useful for professional plumbing diagnostics because it can produce thick, highly visible fog without requiring a new disposable smoke product for every testing cycle.
Plumbers use smoke and fog testing to help locate sewer gas leaks, plumbing defects, broken connections, vent problems, hidden openings, pest entry points, and odor pathways.
For professional testing, the quality and visibility of the smoke or fog matter. Fog that disappears too quickly can make difficult plumbing problems harder to trace.
What Is a Plumbing Smoke Test?
A plumbing smoke test is a diagnostic method that introduces visible smoke or fog into a plumbing, drain, vent, or sewer system.
The technician then watches for smoke or fog escaping from locations where it shouldn’t.
Escaping fog can help identify areas that require further investigation, including:
- Cracked or damaged pipes
- Loose plumbing connections
- Drain and vent problems
- Sewer gas pathways
- Hidden openings and voids
- Rodent entry points
- Pest pathways
- Odor sources
This makes smoke testing particularly valuable when the source of a plumbing problem cannot be easily identified through a standard visual inspection.
What Type of Smoke Is Used for Plumbing Smoke Testing?
There are two common approaches to producing visible smoke or fog during a plumbing smoke test.
1. Plumbing Smoke Bombs and Smoke Candles
Traditional plumbing smoke testing commonly uses plumbing smoke bombs or smoke candles.
The product is ignited and the resulting smoke is pushed through the plumbing or sewer system using a smoke blower.
This method can produce visible smoke for tracing leaks and openings, but smoke bombs and candles are generally disposable. Additional testing therefore requires additional smoke-producing products.
2. Water-Based Fog Fluid
Another method uses a water-based fog fluid and a compatible plumbing smoke testing machine.
The machine heats the fluid to create dense, visible fog that can be introduced into the plumbing or sewer system.
Because the fluid is stored in a reservoir, a professional fog machine can generate fog through multiple testing cycles without requiring technicians to ignite a new smoke bomb for every cycle.
For plumbers performing smoke tests regularly, this can provide a convenient alternative to
traditional disposable smoke products.
What Is the Best Fog Fluid for Plumbing Smoke Testing?
For professional plumbing diagnostics, look for a water-based, high-density fog fluid that provides strong visibility and extended hang time and is compatible with your testing equipment.
Fog density matters because technicians need enough visibility to see where fog travels or escapes.
Sewer Assassin™ High Density Fog Fluid is a professional-grade, water-based formula engineered to produce dense, highly visible fog that travels farther and hangs longer.
It is optimized for the FogTrace™ Plumbing Smoke Test Machine and compatible with most machines designed to operate with water-based fog fluid.
Benefits of Sewer Assassin™ High Density Fog Fluid
- Thick, dense, highly visible fog
- Extended hang time for tracing and diagnostics
- Professional-grade water-based formula
- Optimized for FogTrace™ Smoke Testing Systems
- Compatible with most water-based fog machines
- Stable formula for long-term reservoir storage
- Designed for repeated professional diagnostic applications
When every minute on a service call matters, better visibility can help technicians narrow down potential problems more efficiently.
Why Does Fog Density Matter in Plumbing Smoke Testing?
The entire purpose of a plumbing smoke test is to make an otherwise invisible pathway visible.
If the fog is too thin or disappears too quickly, a technician may have less time to observe where it is traveling.
Dense fog with longer hang time can make it easier to investigate:
- Sewer lines
- Drain lines
- Plumbing vents
- Pipe connections
- Wall and floor penetrations
- Hidden cavities
- Sewer gas pathways
- Rodent entry points
- Pest pathways
- Airflow and odor pathways
Better visibility can help plumbers focus additional inspection work on suspicious areas instead of relying only on guesswork.
What Problems Can a Plumbing Smoke Test Find?
Sewer Gas Leaks and Odors
One of the most common reasons to perform a plumbing smoke test is to investigate unexplained sewer odors.
The location where someone smells sewer gas isn’t necessarily where the underlying opening or defect is located.
Introducing visible fog into the system can help a plumber investigate potential pathways that may be allowing sewer gases or odors into the building.
Plumbing and Sewer Line Defects
Smoke testing can also help identify potential openings associated with damaged pipes, loose connections, improperly sealed fittings, or other defects.
If fog appears somewhere it shouldn’t during a properly performed test, the technician has a visual clue about where further inspection and corrections may be necessary.
Plumbing Vent Problems
A damaged, disconnected, or improperly installed plumbing vent can contribute to odor and drainage problems.
Smoke testing can help technicians investigate the vent system for potential openings or defects.
Rodent Entry Points
Rats American roaches, and drain flies can use sewer and plumbing infrastructure as pathways into buildings.
High-density fog can help pest management and plumbing professionals investigate potential openings in pipes, drains, utility penetrations, sewer connections, and hidden cavities.
Cockroach and Pest Entry Points
Sewer systems can also provide pathways for cockroaches and other pests.
Visible fog can help professionals investigate openings between plumbing infrastructure and the interior of a building that may otherwise be difficult to find.
Plumbing Smoke Bombs vs. High-Density Fog Fluid
Traditional smoke bombs and water-based fog fluid accomplish a similar objective: creating a visible substance that can be pushed through a plumbing system and observed during an inspection.
The biggest difference is how that visible output is produced.
Smoke bombs generate smoke through combustion and are generally disposable.
High-density fog fluid is converted into visible fog by a compatible machine and can support repeated testing cycles from the machine’s reservoir. It allows you to start and stop testing at the push of a button.
For plumbers who perform frequent smoke testing, a fog-fluid system can reduce dependence on disposable smoke products while providing dense, highly visible output.
Can You Use a Fog Machine for Plumbing Smoke Testing?
Yes, a compatible professional fog or smoke testing machine can use water-based fog fluid for plumbing and sewer diagnostic testing.
However, plumbers should use equipment designed or appropriately configured for the intended diagnostic application and follow the equipment manufacturer’s operating procedures.
Not every fog machine or fluid is necessarily appropriate for every plumbing testing application.
Sewer Assassin™ High Density Fog Fluid + FogTrace™
Sewer Assassin™ High Density Fog Fluid is designed to work especially well with the FogTrace™ Smoke Testing System.
The combination gives professionals a reusable way to produce dense fog for diagnostic applications without relying exclusively on disposable smoke bombs.
It can be useful for professionals investigating:
- Sewer gas odors
- Plumbing leaks and defects
- Sewer line problems
- Drain and vent issues
- Rodent entry points
- Pest pathways
- Hidden openings and voids
- Airflow pathways
Frequently Asked Questions About Plumbing Smoke Testing
What kind of smoke do plumbers use for smoke testing?
Plumbers may use smoke generated by plumbing smoke bombs or candles, or visible fog generated from water-based fog fluid using a compatible smoke testing machine.
What is the best smoke for plumbing smoke testing?
The appropriate method depends on the equipment and application. For fog-based testing, a dense, long-lasting water-based fog can provide strong visibility for tracing potential leaks, openings, and pathways.
What fluid is used in a plumbing smoke machine?
Compatible plumbing smoke or fog machines can use water-based fog fluid formulated to generate visible fog. Always check the equipment manufacturer’s fluid requirements before use.
Can plumbing smoke testing find sewer gas leaks?
Smoke testing can help plumbers investigate openings or defects that may provide pathways for sewer gases and odors. Escaping smoke or fog gives the technician a visual indication of an area requiring further investigation.
Can smoke testing find a cracked sewer pipe?
Smoke or fog escaping from an unexpected location may help identify a potential defect or opening in a sewer or plumbing system. Additional inspection may be required to determine the exact cause and condition of the pipe.
Can smoke testing help find rodent entry points?
Yes. Smoke or fog testing can help professionals investigate breaks in plumbing & sewer lines, pipes, drains, and building cavities that rodents may potentially use as entry pathways.
Is plumbing smoke testing only for plumbers?
No. Depending on the application, smoke and fog testing may also be used by pest management professionals, sewer inspection specialists, maintenance teams, contractors, and other professionals investigating hidden openings or airflow pathways.
Get Better Visibility During Plumbing Smoke Testing
The type of smoke or fog you use can make a major difference when you’re trying to trace a difficult plumbing problem.
Sewer Assassin™ High Density Fog Fluid is engineered to provide thick, highly visible fog with extended hang time, giving professionals more opportunity to trace leaks, sewer defects, rodent entry points, odors, and hidden pathways.
When paired with the FogTrace™ Smoke Testing System, it provides a reusable professional smoke testing solution for plumbers and other diagnostic professionals.
Stop wasting time with fog that disappears too quickly. Get the visibility you need to diagnose problems efficiently and complete inspections with confidence.
Order Sewer Assassin™ High Density Fog Fluid
