Soil filtration lines are the dark areas that develop gradually over time.  They are most commonly found along the perimeter of the room, along walls, under floor-length draperies, and under doors.  The lines are caused by air currents and gasses passing through the carpet in these areas.  The air carries microscopic particles of dirt and soot.  As they pass over the carpet, the soil particles settle and become embedded in the fiber yarns.  The carpet, in essence, acts like a filter.  Over time, these soils solidify.

General carpet cleaning can make vast improvements by removing the soil, but discoloration may still be noticeable.  Master Care offers an optional restorative service to remove the filtration soiling discoloration that the general cleaning leaves behind.