Im building a large hydroponics table. the table is 6'x6'x1' with 6 individual troughs that will flood and drain separately. How it works: the controller / timer I need help finding calls to irrigate trough #1, control valve / low voltage solenoid for trough #1 opens, pump starts, trough fills up through hole in bottom of trough, water starts over-flowing into over flow tube back into reservoir, after 15 minutes the pump stops, all water drains back into reservoir through the control valve and pump, when the trough is empty then control valve for trough #1 closes. All of this is going to have to be tried out and timed then programed into the control. Anyways I spent some time at the local hardware stores in town and found all the irrigation controllers / timers have very limited programming capabilities. the only other idea I have is to use a digital light timer in conjunction with an irrigation controller. The light timer would control the pump separately from the control valves. I don't see a problem with that idea long as both the light timer and sprinkler control keep the same time.