It depends on your creativity.....I have a large system on a timer and use a 55 gallon drum for solution. The most expense was the growing mix for me as I collected things for free to make it work. Towers, pump, tubing were all free...seeds came from dollar general at the end of the season sale...

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what are you planning on growing?

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Least expensive to set up (as a beginner) is the Kratky Method. No pumps or plumbing or electricity required. You just need tubs/containers, and some hydroponic nutrients, and off you go!

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