Quote:
Originally Posted by rsrfan
Go to your local garden supply and get an iron fertilizer and sprinkle on your slab and mist with water. How do I know? Forgot to sweep the iron pellets off my patio before the sprinklers went off and voila... Rust stains
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Discolor from Iron is brown....Manganese is black.
If it was a good quality fertilizer....you should have both!
The Manganese stains are harder to get rid of, BTW....