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Some towns still get water to their houses through leaded pipes. This is the most economical way for those people to get water. Others don’t trust their water even if it technically meets EPA standards. And some places just have water that tastes really bad.

Most of America gets water from a tap and maybe filters it.

Sanding won’t hurt the granite other than taking the surface finish off of it. But it might be left with all of the cracks and chips in it still blue.