Depends why you have hard water of course.
I live on a chalk/flint geology and we get hard water with calcium deposits - so everything goes dusty white.
I guess if you live on iron bearing rocks you get red, and copper bearing rocks would give green....
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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