Kevin
Your math is off.
3 times/week times 5 zones = 15 zones/week
15 zones times 20 minutes = 300 minutes/week (5 hours)
300 minutes/week times 4.33 weeks/month = 1300 minutes/month
1300 minutes/month times 10 gallon/minute flow rate = 13,000 gallon/month (estimated flow rate)
13,000 plus domestic needs = large water bill
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