Thanks for your insight. But won’t gnats get into the rockwool. I believe I had a bad case of the buggers. So I’m trying not to do anything gnats can survive in. Maybe I can put up photos.hiya @Buckroid
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the short answer to your question is dwc growers will start seeds in rockwool, rapid rooters, peat plugs, and other seed starting media before transplanting to hydroton ( clay pebble ).