I have a huge lot and don't use anywhere near that amount of water. I run mine only twice a week with 32 minutes on rotator heads and 14 on fixed heads. I use approximately 10 to 12,000 gallons per month during the very dry months and about 6 to 7,000 or even less during the wet season. Zoysia grass goes nearly dormant in the cold season and just doesn't need that much water. You are definitely over watering.
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