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Been watching a lot of aquaponics videos on YouTube - hours and hours worth of them. One thing I have noticed among some of the Australian made videos, was the mention of something they kept calling "blue metal rock". I was thinking this was some kind of special growing media rock / stone. Never had heard of it before, even though I had spent some time in both Australia and New Zealand, years ago. So, I finally got around to taking a moment to look up "blue metal rock". Definition on Wikipedia: It seems to be nothing more than rock / stone used in concrete. That would be pretty commonplace here in Cambodia, I'm pretty sure. So, I don't see why it will not work for our grow beds. Anyway, that's the grow media I am planning on using at the moment. EDIT: In the states, I believe it is what we would call #57 rock, or stone.
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