Aquaponic Gardening

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I am trying to determine which EDDHA Iron product is safe. I have read that some products contain heavy metals such as lead.

Post any product that you have found that has been tested to be free from any heavy metals.

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I use this, approved for use in the State of California.  No specifics on testing.  

http://www.sears.com/growmore-eddha-iron-chelate-6-1-pound/p-012097...

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