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Carpet is capable of holding significant quantities of soil, dust, etc., without appearing very dirty. It has been demonstrated that carpet is quite efficient at keeping allergen and other small particles such as pollen out of the air. In fact, data from a Swedish government study indicates that when use of carpet declined, the number of people reporting allergy problems increased.
Regular vacuuming with a vacuum using a high-efficiency filter and periodic cleaning using the hot-water extraction cleaning (“steam cleaning”) removes the majority of allergen from carpet as well as significantly reducing mite populations.