top of cube= top off water line...the nature of "flood and drain"is it returns the water to your res. therefor if your res is big enuff no prob. maybe you need to increase the size of current res.
divestoned Reviewed by divestoned 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