From my experience in that area it is all about lava rock deposits.
Kris

info @surfacesolutions.com wrote:
> I have a customer in Maui that is complaining about water stains on
> the floor of her highly polished marble shower. They have a water
> softener installed, and the company that installed it, tested the
> water and says that the water is fine. We polished out the mineral
> buildup and sealed the stone and grout with Limestone & Mable
> Protector and after about a weeks use, they have heavy duty water
> deposits on the floor again. They seem to think that we are not using
> a good impregnator because the spots should be easier to clean off. I
> explained to them that impregnators keep the stains on the surface but
> will not do anything about the minerals in the water that are being
> left behind.
>
> They claim that they have the same marble shower in their home in
> California, without a water softener and do not have this problem.
>
> Is there a way to prevent the minerals from bonding so well to the
> polished marble floor? Do you know of a product that will remove these
> deposits with out harming the polished finish?
>
> Thanks
> Greg Cook
> surfaceshawaii.com <http://surfaceshawaii.com>
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Marble Floors And More
Kris Dougherty
3304 N Lindbergh Blvd.
Saint Ann, MO 63074
Cell - 314.503.3062
Fax - 314.298.1227