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What is Filtration Soiling?

Filtration Soiling is identifiable in carpet as distinct lines of discoloration at points where air hits an obstacle. It is caused by differences in air pressure within a room, or between rooms that forces air through the carpet face fibers where pollutants are (filtered) from the air.

Carpet filtration soiling at wall

Soil filtration lines occur most commonly at the bottom of baseboard moldings (at the edges of the walls), in the crevices of steps, around spindles and under doors. They can also occur in the middle of a room if conditions are right.

Very fine particle soils (micro occlusion soils) that are suspended in the air and oily vapors from kitchens, fumes from wood or oil fired furnaces, scented candles, and cigarette smoke are some examples of airborne pollutant sources that contribute to visible filtration soil in carpet.

Carpet filtration soiling at wall

Soil filtration lines composed of oxides of nitrogen or sulfur dioxide can combine with ambient humidity over time to form diluted nitric or sulfuric acid that can permanently alter carpet dyes.

It is possible to reduce or slow the development of soil filtration lines. This can be accomplished by preventing airflow through carpet and carpet edges by sealing cracks in the sub-floor, under baseboards and edges/crevices of stairs. Keep air inside the home as clean as possible by working to reduce indoor air pollutants, such as cooking emissions, fireplace smoke, burning candles, cigarette smoke, and emissions from cleaning chemicals. The installation and regular replacement of high efficiency HVAC air filters is essential to the control of filtration soiling.



Follow this LINK to read what the Carpet and Rug Institute of Dalton Georgia has to say about Filtration Soiling in wall to wall installations of carpets.