I saw a video that claims for sandy soil (mine is 85% sand) it is better to run through the irrigation program three times, each time putting down 1/3 of the intended total time for each zone. For instance, if you had 6 zones and each required 30 minutes, you set the zones for 10 minutes each and run the program three consecutive times. The total water applied remains the same, but runoff is decreased and the wet ground will hold the next application better rather than have it percolate deeper into the ground. Here is the video http://www.youtube.com/user/IrrigationTV#p/u/15/TuV5x7-uNGM The comment starts about 2:35 into the video. I would be interested in your comments, pro or con.