Is Reverse Osmosis water good (or bad) for your health?Given that I’m writing a book about water, accepting an offer to review a home water fi...

Is Reverse Osmosis water good (or bad) for your health?Given that I’m writing a book about water, accepting an offer to review a home water fi...Is Reverse Osmosis water good (or bad) for your health?

Given that I’m writing a book about water, accepting an offer to review a home water filter made sense. But now it’s on my kitchen counter, I’m not sure if I want to use it. My reservation is this — how pure is too pure?
Reverse osmosis (RO) is typically used to desalinate salt water or seawater into drinking water. For hundreds if not thousands of years, desalination was achieved by heating water and condensing the steam (distillation): great on a small scale, if you’re a sailor using the sun to produce a cup of water, but terribly energy expensive on a large scale. RO was a game changer when it became commercially available in the mid 20th century. By using an ultrafine membrane to push the water through, it leaves salt and impurities on one side and pure water on the other.