How to Reduce Microplastics from Laundry: Filters, Bags, and Habits That Work

Most guides on reducing microplastic pollution from laundry list similar steps in similar orders. This guide ranks each intervention by measured effectiveness based on independent testing and peer-reviewed research, so you can prioritise the actions with the highest impact relative to cost and effort.

The short answer

Switch to natural fibre clothing for items washed frequently — this eliminates persistent synthetic fibre shedding at source. For synthetics you already own, use a Guppyfriend wash bag (54% fibre capture) or an external drain filter (70–90% capture). Wash in cold water on gentle cycles in a front-loader and air dry. These steps together can reduce your household's synthetic fibre output by over 90% compared to no intervention at all.

Ranked interventions: most to least effective

1. Switch to natural fibres (eliminates the problem for those garments)

No intervention captures 100% of released fibres. The only way to eliminate synthetic fibre shedding from a garment entirely is to not have synthetic garments. Wool, cotton, linen, and hemp shed particles that biodegrade — they do not contribute to persistent plastic accumulation in the environment or in the body.

The most impactful category to switch first is high-wash items: activewear, underwear, socks, and base layers. These are washed most frequently and generate the highest cumulative fibre load. Natural fibre alternatives exist in all these categories. See the natural fibre clothing collection.

Effectiveness: eliminates synthetic fibre shedding from those items.

2. Install an external laundry drain filter (70–90% capture)

External laundry filters (brands include PlanetCare, Filtrol, and Wexco) attach to your washing machine's drain hose and filter water before it enters the household sewage system. These filters use a fibrous or mesh medium to capture microfibres. Independent testing has found capture rates of 70–90% depending on fibre size and filter type.

PlanetCare uses a replaceable cartridge system — you return used cartridges for professional disposal, ensuring fibres do not simply go to landfill loose. Installation typically requires basic plumbing access to the drain hose — a few minutes for someone comfortable with appliances.

Effectiveness: 70–90% reduction in fibres entering the drain.

Cost: filter units typically $60–$120 AUD; replacement cartridges ongoing.

3. Use a Guppyfriend wash bag (54% capture, reduces shedding rate)

The Guppyfriend is a fine-mesh laundry bag developed specifically for the microplastic problem. You place synthetic items inside the bag before washing. The mesh is fine enough to capture shed fibres while allowing water and detergent to circulate. After washing, you retrieve the fibres from the corners of the bag and dispose of them in general waste (not the drain).

Independent testing by the Fraunhofer Institute found the Guppyfriend captures approximately 54% of released fibres. An additional benefit: the bag reduces mechanical stress on the fabric inside, which decreases total fibre release during the wash. Over time, garments washed consistently in a Guppyfriend shed fewer fibres even outside the bag.

Effectiveness: 54% capture + reduced shedding rate over time.

Cost: approximately $40–$50 AUD. Reusable indefinitely.

4. Use a Cora Ball (26% capture)

The Cora Ball is a plastic ball with a branching structure that you drop into the washing machine drum. Fibres catch on the branches during the wash cycle and can be peeled off after. Testing by Story of Stuff found approximately 26% capture rates. It is less effective than the Guppyfriend but requires less thought — you just drop it in.

Effectiveness: 26% fibre capture.

5. Switch to a front-loading machine

If you are replacing your washing machine, choose a front-loader. The drum rotation in a front-loader creates significantly less mechanical stress on fabric than the central agitator in a top-loader. Studies have found top-loaders releasing up to seven times more fibres per wash cycle than front-loaders washing the same load.

Some newer front-loaders include built-in microfibre filters — LG, Samsung, and others have introduced these in recent model years. Check the specifications when purchasing.

Effectiveness: up to 7× reduction compared to top-loader with agitator.

6. Wash in cold water on a gentle cycle with a full load

Three separate variables reduce fibre release:

• Cold water: Hot water weakens fibre bonding and increases release rate. Cold or 30°C washing reduces this.
• Gentle or delicate cycle: Lower spin speeds and less agitation reduce mechanical stress. Eco programs that reduce water use can increase friction between items (less water = more contact), so check your machine's specific settings.
• Full loads: Items in a full load have less freedom of movement than items tumbling in excess water in an undersized load. Less free movement means less fibre-releasing friction with the drum.

Effectiveness: 20–40% reduction depending on starting conditions.

7. Air dry instead of tumble dry

Tumble dryers release fibres into the air through the exhaust vent — synthetic fibres that passed through the wash process and were not captured. Air drying eliminates this second release pathway entirely.

Effectiveness: eliminates dryer as a source.

Putting it together

If you implement all of the above — natural fibre activewear and underwear, a drain filter on remaining synthetics, cold gentle cycles in a front-loader, and air drying — you have addressed the problem comprehensively. If you can only do one thing now: either buy a Guppyfriend bag (cheapest, immediate impact) or plan your next clothing purchase as natural fibre for the highest-wash items.

Related guides

• Microplastics in Clothing: The Complete Guide
• Microplastics and Washing Machines: How Laundry Releases Plastic
• Do Synthetic Fabrics Shed Microplastics? What the Research Shows
• Shop Natural Fibre Clothing