For that size lot you should be using about 10,000 gallons per month for Zoysia. Set your Hunter controller to water every 5 days (Go to "Water Days" and press the left arrow. Set the left number to "5"). The Hunter MP Rotator lawn heads put down an inch of water in about 70 minutes of runtime. That will soak the ground to about 8 inches. I disconnected the wonky outdoor sensor by pulling the bottom green sensor wire in the control box and then flipping the front switch to "Bypass". It is imprtant to water deep and infrequent so that the Zoysia roots will go into the ground.
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