One of the biggest sources of household microplastics isn't a product you throw away — it's your washing machine. Synthetic fabrics shed tiny plastic microfibres every time they're washed, and those fibres flow out with the wastewater into rivers and the sea. It's an invisible part of the plastic problem, but there's a lot you can do about it.
Why laundry sheds microplastics
Polyester, nylon, acrylic and other synthetic textiles are, essentially, plastic threads. Friction in the wash breaks off microscopic fibres — a single load can release hundreds of thousands — and most are too small for treatment plants to fully capture, so they end up in waterways and, eventually, the food chain.
How to cut the shedding
In roughly descending order of impact:
- Choose natural fibres when you buy. Cotton, linen, wool, hemp and TENCEL don't shed plastic. This is the real long-term fix — the less synthetic clothing you own, the less there is to shed.
- Use a microfibre-catching bag or filter. A wash bag (like a Guppyfriend) that you put synthetics inside, or an in-drum ball / external machine filter, captures a meaningful share of the fibres so you can bin them dry instead of flushing them.
- Wash less often, in fuller loads. Only wash what's actually dirty, and fill the machine — fuller loads mean less friction between garments, and fewer washes overall.
- Wash cool and gentle. Lower temperatures and gentler, shorter cycles shed fewer fibres than hot, aggressive ones.
- Skip the tumble dryer. Drying sheds fibres too (and lint is largely microfibre); air-drying avoids it and saves energy.
- Front-loaders shed less than top-loaders with a central agitator, if you're ever choosing a machine.
The honest priority
Filters and wash habits genuinely help, but they manage a problem rather than prevent it. The prevention is owning fewer synthetic clothes and choosing natural fibres — the same "reduce first" logic that runs through the 5 Rs. (And note: silicone is not the same as plastic, so silicone items aren't a microfibre source.)
Frequently asked questions
Do all clothes release microplastics in the wash? No — only synthetic fabrics (polyester, nylon, acrylic and blends). Natural fibres like cotton, linen and wool don't shed plastic microfibres.
Do microfibre-catching bags actually work? They capture a meaningful portion of shed fibres, which you then bin dry rather than flushing. They're not perfect, but combined with cooler, fuller, less-frequent washes they make a real difference.
Does washing at a lower temperature reduce microplastics? Yes — cooler, shorter, gentler cycles shed fewer fibres than hot, long, aggressive ones, and they save energy too.
What's the best way to reduce laundry microplastics? Long term, own fewer synthetic clothes and choose natural fibres; day to day, use a filter bag, wash full loads cool and less often, and air-dry.
The bottom line
Your laundry is a hidden microplastic source, but an easy one to tackle: choose natural fibres when you shop, catch fibres with a filter bag, wash cooler-fuller-less-often, and air-dry. Filters help with the synthetics you already own — but buying fewer of them is the fix that actually stops the shedding at the source. Fold it into your wider zero-waste laundry routine.
Keep reading: How to Reduce Plastic Waste at Home, How to Remove Stains Naturally, and How to Set Up a Refillable Cleaning System.
