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Hi bsroon. I just used a common 110V timer, namely this one at Amazon:https://www.amazon.com/gp/product/B0191ZGELS/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1I recommend it since it has a nice interface. As noted in the Instructable, I set the timer to run a 6am, 11am, 2pm, 5pm, and 8pm. (These are arbitrary times.) The pump runs 8 minutes starting at each time.There's also this guy on Youtube, who build a larger system:https://www.youtube.com/watch?v=EJjAWF2DfWY
Making and Deploying a Check Valve for a Hydroponics Multi-tier Flood-and-drain Rig
Making and deploying a chec...View Instructable »