I've never heard of a microplasric concern with DI filters. There's always a chance I guess that the actual DI resin beads could get in the water line. I can't imagine they'd break down before they'd be replaced anyhow. And DI water is used for fish tanks, microelectronics, and other applications where you need very pure water. If there was any kind of contamination, they would know.
Water softeners shouldn't introduce microplastics either, it's just replacing Ca/Mg with Na.
its more about plastics leeching into the water, like in water bottles etc, there are people out there that are fanatical (some would say conspiracy level) about using plastics in relation to consumption and even contact with skin. Water picks up little bits (imprints possibly?) of everything it touches. I was involved in the home water purification industry back 20 years ago and know a little about it still.
I mean if it turns frogs gay...
Yeah, I worry about trace amounts of microplastics, pharmaceuticals, and various carcinogenic compounds. That'd why use charcoal filters on the whole water line, and RO/DI for drinking water.
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