Jessica,
As you are in the metropolitan NYC area, you might have much purer water than you might realize. I do know that Manhattanites have water that's so pure, they use the MSU fertilizer for RO water, as using most over-the-counter fertilizers will leave their plants deficient in calcium and magnesium.
I say "might" because I don't know if yours is the same water supply. Give your water utility a call and get them to send you an analysis, or at least tell you the latest dissolved solids content.
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