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What is Filtration Soiling?
Filtration soiling is the accumulation of airborne soil—dust, smog, tobacco smoke and
other pollutants—where airflow is concentrated and directed over or through a carpet’s
pile. The carpet “filters” out these pollutants and gradually becomes soiled and dark.
The most common area you see filtration soil is around and close to walls. Filtration
soil is more evident on white or cream coloured carpet.
In addition to the areas shown in the accompanying photographs, filtration soiling can
occur anywhere air flows over or through the pile, including places where the carpet’s
back has been punctured or torn by installation tools, along seams that about
baseboards, around railings on stairs, and other areas. You may even find it around the
holes created in carpet’s backings by the pins of tackless strip. In these cases, the path
taken by the air differs, but the cause of the problem is the same.
Filtration soiling may appear over a period of only weeks, or it may take months or even years to become
visible. The severity of the soiling will be proportional to the volume of airflow and the relative dirtiness
of the air. Its colour will vary according to the type of contaminants present. Auto emissions are grey to
black; tobacco smoke is tan to brown (and easier to remove by cleaning).
It is most visible on carpet of lighter colours, such as off-whites, light greys, beiges and pastels.
Is the Carpet Defective?
No. Filtration soiling is not the result of any defect in the carpet or its components, nor is it an indication
of low quality. It can appear on any carpet regardless of price, style, colour, construction or face fiber.
Since it is caused by airborne pollutants being deposited on the carpet after it is installed, filtration soil
is not affected by anything done when a carpet or its pile fibers are manufactured. While fluorochemical
soil retardants (e.g., Scotchgard, Teflon, etc.) may make it somewhat easier to remove, no fiber
modification or protective finish can prevent filtration soiling from occurring.

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