DI or Not to DI -THAT is the question !

MrsBugmaster · #1 02-26-2010, 09:54 PM

you can always get a RO bypass valve for the unit and then you can have both

DiverDude · #2 02-26-2010, 10:07 PM

Quote:

Originally Posted by MrsBugmaster

you can always get a RO bypass valve for the unit and then you can have both

Sounds plausable -where might one find such an item ?

fkshiu · #3 02-26-2010, 10:39 PM

An RO bypass is simply a T connector after the RO stage with one end going to "Drinking Water" and the other going to the DI cartridge.

I'm a firm believer in using both RO and DI because each stage better at dealing with certain impurities than the other one - you want to be sure exactly what you have in the end and RO alone can miss some ions that DI would pick up.

The whole "DI water" is bad for you thing is a myth IMO. Drinking pure DI is not good simply because it tastes like crap and not because it will somehow suck minerals from your body like a vampire as some believe. That's why RO/DI drinking water systems always have a "taste cartridge" consisting of coconut husks post-DI to remineralize the water. In fact, most bottled water that you pay through the nose for is simply remineralized RO/DI water. And re-mineralized RO/DI water is just that: water. Putting water through DI doesn't forever taint the water from human consumption - that's just silly.

globaldesigns · #4 02-26-2010, 11:09 PM

Hey Diverdude,

As you know I only have a 2 stage filter with membrane. So a basic RO filter system for my big system. I never have had a problem and my final TDS is only 1-2 ppm. So you don't need it in my opinion, but if you can plumb things to run the DI for the tank and then have RO for drinking, then do it that way.

If you have it, use it!

DiverDude · #5 02-26-2010, 11:22 PM

After much research I do believe that DI water does pull some salts and minerals from your body. However, while we get some of our RDI from water, it's a VERY small percentage. The vast majority comes from food and if you are healthy and well fed, this doesn't appear to be a significant health issue.

TASTE is another matter I hadn't really considered ! Coconut husks ? Really!? Jeez !

As to the bypass, I had (mis)understood that it was a valve of some sort and not just a "T".

Finally, the DI cartridge doesn't seem to be a huge expense (~$29) and with just a 29 Gal tank, I don't see myself going through lots of them so I guess I'll run the DI cartridge for now and see how it goes. The tank will get RO/DI and we'll drink plain RO.