For those with a well and septic system, the only waste is the tiny amount of electrical power used to pump the water.
We can quantify the costs. It's generally accepted that with a well pump and 100 feet of head, at 10c per KWH it costs 0.2 cents to pump 1 gallon per minute for an hour. Or if you take 2 minutes to brush, about 0.006 cents.
Of course, there is a cost to heating the water if done so with the most expensive method possible, electric power and you use hot water. 70c to electrically heat a 50 gallon tank from 50 to 140 degrees. There is then some dilution and significant initial loss with such low flows. Maybe a penny or two to heat the water?
We can quantify the costs. It's generally accepted that with a well pump and 100 feet of head, at 10c per KWH it costs 0.2 cents to pump 1 gallon per minute for an hour. Or if you take 2 minutes to brush, about 0.006 cents.
Of course, there is a cost to heating the water if done so with the most expensive method possible, electric power and you use hot water. 70c to electrically heat a 50 gallon tank from 50 to 140 degrees. There is then some dilution and significant initial loss with such low flows. Maybe a penny or two to heat the water?
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