If you have time and dont mind few cents for the water bill, setup your system and have everything connected and fill controller box until very top float switch looks level (thats when it would shut off) to include all your buckets. The controller box and all buckets will have the same water level. VERY IMPORTANT: Make sure the controller box and buckets all are at the same height. Meaning if the controller box is on the floor, all the buckets go on the floor also. If you dont have everything at the same height you WILL have a flood. Just depends what is at a higher height to where your flood will be. When you have all the water in controller box and buckets, plug electric in for controller and put it on Drain cycle (it most likely already will be) and drain controller and buckets back into your rez. You now have one of the most important things you need to know, how much is the min water you need to flood :thumbsup:. I took about a 4ft section of spare pvc I had laying around from a plumbing thing I did at the house and put in rez to get water line and mark with a Sharpie. You now have a dipstick so you can tell in a heartbeat if water is high enough to flood and also (if you have gallons marked on stick) keep track how fast the lil ladies are drinking. Oh btw on the side of your rez (55 gal barrel) gallons should be molded right into the side of the barrel. You can mark your stick from that so you know gallons in rez for nute mixture. :jumphappy: