Buying RO / DI - I know nothing

[hillegom]

I see that link to costco has a pic of the unit. This is a new system and I have not seen one yet. I guess it doesn't waste water as it uses the pump, electrically operated, to push all the water through the RO membrane. But this would coat the membrane with all the "bad" molecules you would normally pass out to the drain. So I would check to see how long of a life the membrane is rated for.
Normaly, Ro units make one gallon of good water and 4 gal down the drain. This will flush all the bad things down the drain, and this will lengthen the life of the RO membrane .
You could always plumb the drain water outside and water the lawn. Good only in the summer though!

[macky]

The Watts RO zero waste system sends the waste water into the hot water line to be used for washing clothes, showering, etc. The bad part is that it only makes RO water when it is able the send the waste water into the hot water line(hot water has to be on and running). Therefore, the amount of RO water produced depends on how much hot water you use.
I chose to buy the one that wastes because I didn't think that the amount of RO water produced by the zero waste model would be enough for all my drinking water and tank water.

[Myka]

If you guys really believe RO or even RO/DI water is ok to drink, go check out what the World Health Organisation says about it.

[subman]

After reading as much as I could take and then trying to navigate the WHO website. I can't see any where that says Ro water bad! RO/Di on the other hand seems to be a great debate and after further understanding why it's bad for us, it make me not want to use it at all for my tanks or anything for that matter.

[hillegom]

RODI is good for tanks. You start out with just pure water, and then add salt. So the water then is perfect, no phosphates, or heavy metals