Elken( RO), Amway (Espring) Diamond are MLM companies, all have good products but not worth paying that kind of money . I have a friend who market Diamond water can earn up to more than $700 per set. I have been in MLM before, so I also know the company mark up easily more than 200% in order to pay the distributors and their own profit. The more reasonable one is from cosway.
I am currently using a combination of water filter (Aquaphor from Europe ) and Actimo Hexagonal water (from Korea). Both add up still much more less than any of the 3 MLM companies price. But the result is amazing too. My hubby observed that his urine is more yellowish and odour (as stated in the instruction manual that's because of detoxication) and he getting thirsty easily so prompt him to drink more water without getting bloated.
The actimo hexagonal water is a reverse system that simulate our environment to product stream water which consist of higher oxygen level, it need to spin the water for about 9 mins to ensure more contact time rather than other so call energy water which just flush through ceramic bead for less than 1 sec. Which one do you think is more logical?
I think the best water is natural living water that consist of certain mineral, fresh and with high dissolved oxygen.
Just my 2 cents.