i flood my system every 6 hrs while lights on...and not at all when its off.if your resevoir is big enuf you need not worry bout it runnin dry..least not within a week or so.the best method for finding how often to water is to let them get a lil thirsty while you time how long it is before they start to wilt...it is totally possible to over water a flood and drain system.your intent is to water them only as often as necessary (which changes depending on plant size,phase,and how deep the roots are into w/ever medium your runnin).

Dive:stoned:
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