The whole system is controlled by a PLC and a touchscreen . everything is monitored and we have backups for everything , for example if a return pump is pumping 10% below it normal flow the system will turn it off , turn on a backup pump and then notify us to repair the old pump . there are ultrasonic level controllers in the sump and send floor surge tank to monitor the water level . the whole system is heated by boilers and a titanium heat exchanger and solar in the summer . cooling is by ground loop with cold water back up . there are 4 return pumps and one closed loop pump with 9 2 inch motorized ball valves for basic circulation . the sure has a 300 gallon tank on the second floor of the house that fills and dumps on either side of the tank by a three inch motorized valves controller by the PLC . that's the basics . the tank is 24 feet long , 10 feet wide and 10 feet deep . the walls are 10 inch concrete and the floor is 12 inches . each window is 6 feet by 10 feet and 2.5 inch thick and weigh 1100 pounds each . right now it is lite by 12 400 watt metal halides and we can grow acros at the bottom . I plan to add 4 more light soon .