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RE: Communities with Purple Piping are Seeing Green
To be honest, I never thought that a certain color on pipes for water has any meaning, since in my country they are almost the same color and I have to notice that you have thought up this very correctly and this can be decisive in certain situations!
This is the US system, but it may not be the same in other places. It does require some advanced planning, which is why it isn't in use in older locations that didn't have as much of a water problem when they were built.