Quote:
Originally Posted by DAVES
Ferrous oxide, essentially rust, is not the only iron source used in fertilizer. Iron sulfate comes to mind and I'm pretty sure there are others. Yes, any of them will leave stains on cement.
That is not at all the problem or the cause as the stains are clearly where the sprinklers hit and there is no, or should be no connection between your plants and chemicals you apply and the water system. The reason why homes that use potable water are their lawn, must have a back flow preventer.
My question was I and many others use this partly processed water and it hits stuff like veggies and fruits you may be growing.
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Good question about the "things" in the water which make their way into the vegetable and fruits you're growing. If you've never been on the University of Florida's Institute of Food and Agricultural Sciences website, you should check it out. And/or you could always contact them with your question to get a factual answer.