All this discussion over what colour tap water should or should not be is the exact reason why you should be using RO/DI even if your tapwater is usually OK - consistency.
RO/DI will always be the same beautiful blue water and you know exactly what is in it. All it takes to destroy your entire reef system is a sanitation crew outside mucking around with the pipes and stirring up a bunch of crap just when you're changing your water. Visually you may not even notice, but your system sure will.
This is coming from someone who lives in the GVRD where we routinely get ~10 TDS coming straight from the tap. I probably could get away with using just tap, but the 2 weeks of brown water we got last winter completely justified the RO/DI investment. My pre-filters were nasty after that incident - filled with stuff that could have otherwise gone into my tank.
And you don't need to "waste" any water with RO - collect it and use it to wash your clothes or water your garden.
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