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Filtration soil

Airborne particulate the carpet caught while acting as a filter. Nothing walked it in and no amount of vacuuming will take it out.

In detail

The dark, sharply defined bands that appear where carpet meets a skirting board, under a door that stays shut at night, beneath floor-length curtains and around floor outlets and heating ducts. It looks like neglect and is not: wherever air passes between the room and the space under or behind the floor, the pile filters it. What it catches is far finer than ordinary soil — combustion particulate from candles and cooking, traffic soot, dust below the size a cloth meets. That fineness is why it embeds deep in the fibre rather than resting on it, and why domestic cleaning does not touch it. Removal needs professional chemistry, may be incomplete, and is exceptionally difficult on wool or olefin. The honest household answer is prevention, and it is structural rather than chemical. The line marks an air path, so sealing gaps between floor and wall during any flooring work removes the cause. Changing ventilation filters, using a vacuum's edging tool along skirting boards, and burning fewer candles all reduce what the carpet is being asked to filter.

A room drawn in section: air moves across the room and out through the carpet at the gap between floor and skirting board and beneath a closed door, and a dark band appears in the pile at each of those lines.
A room drawn in section: air moves across the room and out through the carpet at the gap between floor and skirting board and beneath a closed door, and a dark band appears in the pile at each of those lines.

Why

Sources for this page

Sources

  1. Consumer Floor and Furnishings Care Information: carpet topics

    Institute of Inspection, Cleaning and Restoration Certification (IICRC) · Trade or professional body

    Relied on for: That soil filtration lines develop where air passes over carpet at skirting boards, closed doors, curtains and ducts, that the carpet acts as a filter catching airborne particles, that the soil is exceptionally fine and embeds deeply, that removal is professional and may be incomplete, and the preventive measures of sealing gaps, filter changes, edging tools and fewer candles. (states this directly)

    Verification: a person has read the passage relied on.

    Read on — All twenty-five numbered topics. The damage sections (17-25) and the animal, mould and residue sections carry most of what was new. Supports a wider statement — our claim was widened. The single richest source this register has acquired. It supplies six mechanisms nobody here held — wicking, cellulosic browning, filtration soiling, rapid re-soiling, delamination and phenolic yellowing — and every one of them is a case of DIRTY VERSUS DAMAGED, the distinction this catalogue is built on. It also closes the pet-odour question Sprint 48 left partial: the reason the smell returns in humid weather is a reservoir in the backing and padding that surface cleaning never reached, not the rehydrating uric-acid story consumer pages tell.

Last reviewed by a person on .

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