The cheapest media I can buy from Hummert is rice hulls, the last time I looked.
If I were experimenting with low-budget hydro, I would try gravel, straw bales, and maybe sawdust if I could get that for free. Cost is the limitation with hydro. It's easy to spend $300 to grow $30 worth of tomatoes. Doing it to make even a small profit is the real challenge.
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