Filtration soiling-why and what causes it!!
Why Do Carpet Edges Turn Black?
Have you ever noticed dark or black staining along the edges of carpet—especially near baseboards or doorways, most commonly in older homes? This is often caused by filtration soiling.
What is filtration soiling?
As air moves through your home, it carries tiny airborne particles such as dust, soot, oils, and combustion residue from furnaces, fireplaces, candles, cooking, and outdoor pollution. When that air is pushed through small gaps along walls and under doors, the carpet acts like a filter—trapping those particles along the edges.
Why is it more common in older homes?
Older homes often have:
• Less effective air sealing
• Older HVAC systems
• Years of gradual buildup
• Increased airflow through wall cavities
Can it be cleaned?
Professional cleaning can often improve the appearance, but in many cases the staining is extremely difficult or impossible to fully remove. Over time, these particles bond deeply to the carpet fibers—and sometimes even the backing.
Important to know:
This is not mold and not caused by poor housekeeping. It’s a long-term airflow and air-quality issue.
If you have questions about carpet staining or would like an honest assessment of what cleaning can (and can’t) do, we’re always happy to help.
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Notice the dark edges even after a thorough truck mount clean.
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