What is Carpet Filtration Soiling?

Filtration soiling, otherwise known as “draught marking”, is a common occurrence in homes and businesses with carpet. Filtration soiling is not an indicator of inferior carpet quality but, due to the dark lines it creates, it is much more pronounced on lighter fibers.

Soiling occurs when dust and airborne pollutants accumulate in areas of the carpet with concentrated air flow or where there cracks in the subfloor. It’s most often seen beneath interior doorways or around the baseboards of a wall and is most common on entryways leading to lower levels of the home.

The volume of pollutants in the home and the level of air flow the carpet is exposed to will impact the level of soiling and how fast it occurs. Some common airborne pollutants known to cause filtration soiling in carpet are cigarette and cigar smoke and cleaning chemicals. The airborne pollutants trapped in the carpet attract oils, dirts and residues which then lead to the dark coloring and lines you will see in your carpet.

carpet filtration soil

Waukesha Carpet Cleaning Blog has several easy steps you can take to help reduce the chance of carpet filtration soiling in your home, the first being to reduce the amount of air pollutants in your home:

Reduce Pollutants

Stop filtration soiling at its source by reducing the number of airborne pollutants in your home. If you smoke, try to restrict it to patios, balconies or other exterior areas surrounding your home or business. When cleaning, try to use homemade green cleaning supplies like water, vinegar and baking soda instead of store-bought cleaners composed of solvents, detergents and harsh chemicals. You can also hire a professional carpet cleaner that specializes in green cleaning services, like Champion Chem-Dry in Brookfield.

Reduce Concentrated Air Flow

To reduce concentrated air flow you will want to leave all your interior doors open whenever possible. This will spread the air flow from room to room across a much larger surface. It’s also recommended you seal all cracks around the baseboards of your wall or if you know of any within the subfloor of your home.

HVAC Filters

Be sure to use high efficiency HVAC air filters in your home. It is also important to replace them regular to ensure they’re working at their maximum capability and you’re receiving the best air quality.


This isn’t the first time we have emphasized the importance of routine vacuuming. Proper vacuuming can help maintain the quality of your home and remove the air pollutants from the carpet surface prior to them attracting oils and other dirt that might lead to filtration soiling. You will also want to be sure to empty the vacuum bag on a regular basis.

Call a Professional

If carpet filtration soiling has already occurred and you want it removed, you will want to call a professional carpet cleaner in Waukesha. Filtration soiling is a very difficult stain removal process and requires advanced training and equipment to do so.

Champion Chem-Dry technicians are trained to remove filtration soiling in carpet and have seen excellent results for customers in Menomonee Falls, New Berlin, Delafield, Pewaukee and surrounding WI cities. Even better, Champion Chem-Dry uses cleaning solutions comprised only of ingredients from Mother Nature.

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