Boiling tap water can get rid of 90% of micro plastic in your tap water.
At least my pasta should be almost plastic free.
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Microplastics they studied are less than 5mm. I think I'd see that, and that just filtering would take care of it.
I don't know that nanoparticles aren't of more concern. (nanoparticles are 1 nanometer to 1 micrometer - thousands of times smaller than the width of a hair - around 80-100,000 nm)
Am I right to assume the nanos and the micros are coagulated by the Ca+?
Microplastics:
https://oceanservice.noaa.gov/facts/microplastics.html
Just some questions to ponder.