ro filter

[Aquattro]

Answering my own question here. I suspect you are confusing DI with Ion exchange resins, which "trade" various salts for the removed contaminants.
A DI resin operates a little differently.
"Deionizers are complete “ion exchangers”. In a deionizer, water flows through a chamber filled with “cation” and “anion” synthetic resin beads. Millions of hydrogen ions (H+) are loosely attached to each cation bead and hydroxide ions (OH-) are attached to each anion bead. Passing water exchanges all its positive ions for H+ ions and all its negative ions for OH- ions.

Released H+ and OH- ions react with each other, forming H-OH or H2O, which is water."

And water, we all know, is good fer drinkin" ! [img]tongue.gif[/img]