View Full Version : RO/DI water

04-12-2005, 2:08 PM
I have a 5 stage R/O unit I’m currently using for my saltwater tank.
I just purchased an add on DI unit for it and was going to hook it
up tonight. I assume it would go as the last stage of purification.
My question is, if I just used the DI unit, would I have to
de-chlorinate the water before I used it? I like the R/O water, but it
uses SOOOOOOO much water. Do you think its worth the waste
to use both until, or would DI be just as good as the R/O by itself.
Thanks for you time

04-12-2005, 3:33 PM
I have not read up on this for awhile, but I am certain they could not continue to sell 5 stages of filtration if only the last one really worked. The first stage is of course the gross particulate fiber/floss. Stage two is charcoal to eliminate the chlorine which would destroy the RO. Next is maybe smaller micron particulates. Then the RO which filters molecules down to like .001 microns but misses some dissolved substances like maybe phosphate. That is where the DI can attract and hold dissolved contaminants. My vendor feels the DI is superfluous for human consumption but corals can tell. Just running the DI alone would prove expensive as it would degrade/become saturated quickly.

If you are truly concerned, try retaining the waste water for gardening this summer. What we are eliminating is mostly fertilizer anyway.

04-12-2005, 5:22 PM
Thanks for the information wildemon.
I will use the RO/DI combination.
Thanks again