R/O less D/I anyone?

[Saltysteve]

Thanks for the replies guys. I have been using commercial, delivered bottled R/O water in my tank since day 1. I live in the mountains so my "home brewed water" is starting off with a much better chance compared to treated city water etc, or at least my membrane will last longer In using the R/O bottled water I still get diatoms, cyano etc. Wonder if the D/I part of the system is the ticket. D/I filter with canister (holder) lines etc is roughly another 80 to 100 bucks on top of the unit I got.

Anyone do any major water tests between R/O and R/O D/I?