While I certainly knew what RODI was before getting into the hobby I didn't realize the benefits of it in our application. I started my daughter's betta tank and son's glo-fish tank using tap and some sort of cleaner. I was always fighting excessive algae. Once I started looking into a reef tank I started buying DI from kroger for them and haven't had significant algae since. New RODI unit should continue that for me.
I suppose tap works but for the investment most of us will make in livestock it's probably worth investing in an RODI unit for the long term.
