When will I be able to start reducing my water? 

After the third treatment you can start to slowly reduce your watering.  We recommend reducing your water time 10% per week and watch the results.  Verify the health of your lawn continues to thrive before reducing another 10% and so on.  Keep in mind that the amount of watering time is different between Spring/Fall and June/July/Aug.  Calculating water reduction will be different for the different seasons in Utah.