Carpet acts as a filter. Not the type that can easily be replaced; the type that continues to collect everything. Dust. Pollen. Human skin cells. Pollution from the outdoors that has travelled on pavement and streets. Busy office settings -- particularly large open plan areas -- these factors combine to create a perfect storm against the carpet. With each step, dust, pollen, etc. are pushed deeper into the carpet. While vacuuming does remove some of the surface debris, it does not restore the carpet. It merely cleans the surface layer. Read more: ziply.pk/CXqDDq