Water softener and RO

[asylumdown]

Turns out the house builder totally messed up and never hooked up our water softener. I was sure this was the case for months, but it was finally just resolved now. The softener only sends water to certain cold water taps in the house, but all hot water taps. Since I was sure the softener wasn't working, I have the taps to my RO unit at 80% cold, 20% hot so that the water going in to the unit is lukewarm (I've heard they're more efficient that way). Now that the softener is working on the hot water taps I'm not sure if I should shut the hot water off? Is softened water bad for RO units?