What causes filtration soil lines?
Filtration marks are the result of oils and fine particulate molecules that bond to carpets, furniture, walls, and ceilings because of an electrical charge. The old adage, opposites attract is certainly true in this case.
The lines are created because as your furnace or heater runs, the air being loaded with added pollutants, rises and cools, then falling back down and depositing itself on cooler surfaces. This is because warm air is attracted to cooler surfaces.
The air seeks out cooler surfaces like outside walls, other rooms, or passage to cooler places like in the walls or under floors. A building breathes through these cracks and crevices, and as it passes from one place to another, carpeting acts as a trap for the pollutants.
Most homeowners and business people have never really considered that the largest air filters in any building are the carpet, upholstery, and drapes. This is why the lines appear at doorways where the doors are always closed or along the baseboards. As the air passes through the fabric, the oily particles are trapped and the black soil filtration appears.
Why is it so hard to remove?
The oily soils are so small, that they not only form an electrical bond, but they may also fit very nicely onto the very sites on the fiber designed to hold the color of the carpet, also known as dye sites. It makes the filtration soil hard to remove. Even professional carpet cleaners have limited success removing soil filtration lines and spots. If the soil filtration comes out you can consider yourself lucky because it is a very rare occurence.
Why Are My Carpets Black or Dark?
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