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Great idea and a real cost-saver! I will be borrowing this idea for my raised bed garden area off my kitchen! I always worry about the effects of treated lumber when used for growing food. This seems like a pretty good work-around solution!
 

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Very nice!! Great idea!!

<(B^)
 

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any idea how long the steel will last when it is constantly wet/damp? nice idea.
 

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Treated lumber process is a lot more safe than it was in previous years, plus the dirt is isolated from it by the corrugated metal.

The corrugated metal should last for decades as it dose when used for roofing or siding.
 

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I remember hearing that the Galvanizing process imparts metals such as zink to the finished product. You might want to do some research as these metals may be worse than the pressure treated wood. I might be wrong but I don't think so. It's not like plutonium but personally I would line it with cedar, it would last for many years.
 

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For planter boxes the zinc will leach around the metal, but does not uptake into the soil very well. It has relatively low bio-availability. It might affect the micro organisms as some of them with thrive and some will not with zinc. Vegetables grown would be safe to eat and should grow fine in a balanced soil.
 

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Saw your project and thought of the planter box that I made for my wife.



It won't float cause I drilled holes in the bottom to provide drainage.

When I was a boy, we use to make these with an outrigger and it provided a lot of fun.
 

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