[They claim to](https://www.zerowaterfilter.com/blogs/news/does-zerowater-remove-microplastics), or at least did. Searching around a bit, that does seem to be a disputed point and the only part of this filter I haven't actually seen tested (Project Farm didn't test that and I don't really know how to test for it myself). It's also not discussed in any of their newer documentation or advertising so it may very well be wrong. Take it with a grain of salt I guess.