What is the Grow Bed made from/material? Has the steel been tested for lead?

What is the Grow Bed made from/material? Has the steel been tested for lead?

We have not had the zinc aluminium coating of the steel Grow Bed evaluated by a lab to certify that it is free of lead.  You can certainly use the Subpod with a wooden garden bed, or perhaps you can find a local steel garden bed that has been lab certified to be free of lead as a second option. 

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