It seems like there are varying definitions of microparticles. Are you referring to stuff that is still slightly visible to the naked eye (if you squint), something the requires a regular microscope or something that needs an electron microscope. I'd like to think that my zerowater filter which filters out enough such that a TDS meter reads 0 would filter out microplastics but who really knows. I don't inspect every cup of water I drink with a microscope.

I always wondered why there hasn't been more of a push to explore plastic pyrolysis technologies to help remove these plastics from circulations. I see countless pictures of discarded clothing, and other plastic based waste and I'm thinking that there is some potential solution: break it down back into its original oil based input.