I had a really good setup. A 30'X30' greenhouse with a concrete floor. It had a 4' square hole in the middle of the floor for the nutrient solution tank. I had 20 10' joints of 6" PVC pipe with 2" holes cut every 18". I had a submersible pump that cycled on/off every three minutes. It was fascinating watching the plants choose (on their own) how much nutrient/water to take up. On very hot days, they would take up mostly water and the strength of the solution would go way up. I then added more water 3-4 times per day. On more mild days, they would take more nutrient than water and the strength of the solution went down. Growing is just as much fun as using under those circumstances.
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