Hey All, I flood my 22"x22" tray 5 times in 24 hours.1st light on.3 more floods with lights on and one flood 6 hours before lights on.The floods are for 15 mins from start of flood till it is all drained back to the res.I read that floods should only be as long as 15 mins from time it is flooded to the time it drains back to the res should not be any longer than 15 mins max.All I know it work for me.If the site lets me I'll post some pixs of my fllod cab and grow. PEACE