No these were caused by an iron grid that was supporting the center
rock in my bubbler as well as preventing the river rock from falling
into the basin underneath.

On 27 Feb 2004 04:37:25 -0800, (J. Del Col)
wrote:

If the rust is caused by iron-bearing minerals in the rocks, no.

If you use various products made for removing rust stains from sinks, etc, the
stains will reappear after the rock has been out in the weather for a while.

J. Del Col

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