you have to have a big enough reservoir to allow the tray to be flooded and start to drain back to rez before res level gets below pump. does this answer your question? If you are still queried, then search ebb and flow, and check out the fill/drain fittings. the tall one is the drain.
researchn what size reservoirs are used with a certain model tray. usually 40 gallons for the 3x3 trays I think. peace
latewood Reviewed by latewood on . flood and drain question???? the question i have is i see alot of people using flood and drain method and they say there cycles go every 4 hours while the lights are on for about 15 min. Now are they running there pump constantly for 15 min. if so doesnt the reseviour run dry eventually and wouldnt this ruin the pump or maybe am i seeing this whole thing wrong pls explain i was looking at a system simialr to this one but a larger scale this is for example purposes only Rating: 5