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Heavy-Duty Timer 2 4 6 8 Way Box Grow Light Electric Contactor Hydroponics

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Can someone tell me how to make diy rdwc system

I have four 17 gallon totes that hold approx 10 gallons of water. 1 or 2 plants per tote. Guy at my hydro store didn't tell me much on how to make it and when I asked how to connect tubing/pvc he said just drill the size hole and put tubing in it and it won't leak. the tubing for undercurrent. also if someone could tell me how to do waterfall effect too would be appreciated

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