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That was the big thing about 25 years ago. Big ebb and flow tables with rockwool slabs. Now it seems like most people grow in a soilless mix. That's just what I gleaned from reading High Times. I started growing tomatoes hydro in the 8th grade for a science project. I grew in geolite which is puffy pebbles. My grandfather bought me a 250 watt MH and HPS conversion bulb.
I bought some clones almost 20 years ago and they were started in rockwool and then rooted further in plastic party cups in soil. I'm thinking of buying a tent and growing herbs and tomatoes hydro. I figure the grow will cut down on my heating bill, and fresh herbs are very expensive.