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I'm kind of surprised that washing machines don't have that sort of filter already. I recently cleaned out two of the filters in my own washing machine and it did a pretty decent job catching a lot of things. I guess because it's so fine it would have to be cleaned out more?

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we're talking sub-micrometer here, I doubt that the usual sieves can handle that

You'd want a lot of pre-filters to catch bigger lint. And those pre-filters will need to be readily accessible for the user to clean out. And you'd want a system for detecting the filter is full to warn the user. Otherwise you're looking at a lot of unhappy people as their washing machine fails to drain a lot of the time as things clog up with lint.

Samsung developed a microplastic filter that works with any washing machine.

Claims to capture 98% of microplastics.

It compacts the lint so that you only need to empty it once a month. Reports remaining capacity via SmartThings.

https://news.samsung.com/global/samsung-launches-less-microf...

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