I use to use RO water on my old er tanks and then switched to RO/DI after after got a awesome deal on a 100 GPD RO/di unit 5 stage. Like RO/DI better .
mike 
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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