I use to grow in flood & drain. I started with rockwool but it was costly and hard to get rid of. I ended up putting a cover over the tray. I drilled holes for net pots in the cover that I filled with perlite. Did 80 site SOG. Worked really well and found it easier and cheaper than rockwool. I didn’t reuse the perlite though. I hear that it can be reused. You could do the same thing with the pebbles.
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