Water filters can neutralize fluoride or prevent large molecules while allowing beneficial minerals to pass through.

“And that's because these filters have been very cleverly designed in order to neutralize fluoride or to prevent large molecules, such as sediment and dirt, which is kind of easy to imagine being filtered, but also to allow certain small molecule, like calcium, which is small-ish, or magnesium, which is small-ish to still pass through into our drinking water.”