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Yeah, reverse osmosis systems adding microplastics themselves is a scary fact I also learned on hacker news a few months ago.

Does anyone here know if they are RO systems that don't have that problem?

Microplastics are just unavoidable at this point, they all use plastic tanks and tubing. But RO will still remove heavy metals and PFAS.

TIL from the parent comment, even I am curious now about RO systems which do not have this problem.