What microfibres are
Microfibres are tiny strands of fabric that break away from clothes, towels and cloths. They are most often discussed in relation to synthetic textiles such as polyester, nylon and acrylic, which are made from plastics derived from fossil fuels. These fibres are too small to see individually, but they can collect in lint filters, on surfaces and in the water leaving a washing machine.
Natural fibres such as cotton and wool also shed fibres. The reason synthetics get particular attention is that they do not break down readily in the environment, so the pieces can persist for a long time. Natural fibres are not automatically harmless either, because dyes and finishes can be carried with them. Research on the effects of both types is ongoing.
How shedding happens in the wash
In the wash, fabric rubs against itself, against the drum and against other items while moving through water and detergent. This friction loosens fibres, particularly from fabric that is knitted, brushed or fleecy, or that is old and worn. Some of what is lost is whole fibres, and some is fragments from the fabric’s surface.
The wash water carries them out of the machine. Wastewater treatment works typically capture a large proportion of the fibres, which end up in the sludge that is separated from the water. That sludge may then be incinerated, landfilled or in some places spread on farmland, so the fibres can still enter the environment by another route. Some also pass through treatment into rivers and seas. How much depends on the local system, and it is hard to give a precise figure.
What the evidence says, and does not say
It is fair to say microfibres have been found in many environments, and that laundry is generally regarded as one source among several, alongside tyre wear, industrial processes and other textile activities. How large a share laundry contributes, and how harmful the fibres are to wildlife or human health, is still being studied. Results from laboratory tests can differ from what happens in a home, and published comparisons often use different methods, so it is hard to compare numbers from one source with another.
For that reason, it makes sense to treat any claim about exact reductions with caution. The measures below are plausible and widely suggested, but their effects vary.
Things that may reduce shedding
Wash less often. Fewer washes mean fewer chances for fibres to be released, and clothes generally last longer. Spot cleaning, airing items and washing only when something is dirty are simple habits. This also reduces water and energy use.
Run full loads. Some testing suggests a fuller drum means less movement and friction per item, although too full a drum cleans poorly. Aim for a well-filled but not crammed machine.
Use gentler cycles and moderate temperatures. Shorter, cooler, lower-spin programmes may reduce the rubbing that loosens fibres. Washing at lower temperatures is already a sensible energy habit, and it may help here too, though study results are mixed.
Choose detergent carefully. Some tests suggest that powders, being more abrasive, may increase shedding compared with liquids, while others do not show a clear difference. It is not a firm rule, and you should still pick the product that cleans your clothes properly at the dose recommended.
Consider the clothes themselves. Garments differ a lot in how much they shed. Fleece and some knits tend to release more, and shedding is often highest in the first washes of a new item and as fabric ages. Buying fewer, longer-lasting clothes, and checking secondhand shopping options, helps to reduce overall consumption. Fast fashion tends to encourage short-lived, frequently washed garments, while sustainable fashion approaches emphasise durability and care.
Filters, bags and balls
Several products claim to capture fibres.
- Wash bags are placed around clothes in the drum. They can catch some fibres and may reduce friction, but how well they work varies, and not every bag has been tested independently.
- Laundry balls or similar items placed in the drum are meant to trap fibres. Evidence of benefit is limited and mixed.
- External filters attach to the machine’s outlet and trap fibres from the water before they leave. They can capture a notable share in tests, but they need regular cleaning, can be hard to fit to some machines, and may affect the warranty or how the machine drains. Check with the manufacturer before fitting one.
- Built-in filters are starting to appear in some machines, and regulation in some regions is being discussed. Availability and performance vary.
Whatever you use, what you collect must be handled properly. Fibres caught in a filter or bag should go into the general bin rather than being rinsed down the sink, otherwise the benefit is lost.
Putting it in proportion
Reducing microfibre release is worthwhile, but it is one of several ways laundry affects the environment, alongside energy, water, detergents and the wider burden of plastic pollution. The most reliable steps are also the simplest: buy fewer, better clothes, wash only when needed, run full loads, and use a filter if you want extra capture and are prepared to maintain it. It is better to avoid claims that any product eliminates the problem, because none currently does.