1) find how many gallons of water is being used on the toilet each day.
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2) multiply the value by how many days in a month on average.
From the internet:
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= 2817 gallons/month
31 days:
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= 2869 gallons/month
30.5 days (average of 30, 31 days):
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= 2823 gallons/month
30 days:
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= 2777 gallons/month
29.5 days (average of 28, 29, 30, 31 days):
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= 2731 gallons/month
29 days:
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= 2684 gallons/month
28 days:
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= 2592 gallons/month