Hmm... Interesting. I did not know about the reverse osmosis before now. Thank you for sharing. The equipments to run the process should be quite expensive, so most 'pure water' factories will not use this method of purification.
What I am curious to know @greenrun are there cheaper ways of truly purifying water? I ask this because I have seen some peddlers peddle all sorts of chemicals in little bottles and give almost godlike properties and I have a mother who is susceptible to their trickery.