"lowest bidder parts"? The water sensor works and works well - check to see after it rains whether it shuts the sprinklers off and for how long. I would never turn off the sprinklers since if it does not rain for a few days the grass starts to stress; my neighbor left his off for a week and his grass turned brown. Some people only water twice a week for longer periods and some four or more times a week for shorter periods - personally I found that the latter works best on my lawn. Water and supplement your landscapers fertilization program with your own every so often and your grass will look great.
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