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RE: Student invents a filter that removes 96% of microplastics from drinking water/Estudiante inventa un filtro que elimina el 96% de los microplásticos del agua potable
Some experts point to the need to ensure that the process leaves no ferrofluid residue in the water and that the captured microplastics can be safely and permanently disposed of without causing further pollution.
Yeah, this was my first thought. No idea whether ferrofluid is safe to drink or not. It says "most" of the ferrofluid is recovered, which seems to imply that some could be left behind in the filtered water.
What doesn't kill you makes you stronger. ;-)