As a practical matter, the sensor that turns off the water when it rains is not going to save you very much money. If you water two times a week, it may prevent a few excessive waterings in a month. But, irrigation water only costs about 22 cents for 100 gallons of water. Most people can save more money by reducing the watering duration setting on their controller. For most lawns, I think 20-30 minutes twice a week is way too long. I only water for about 5 minutes per zone and have had no problems. Reduce you watering time and see what happens.
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