If you have a demand water heater you should flush with vinegar at least once per year.
My cloths washer has a cleaning cycle that should be run once per month.
I run the dishwasher with a small bowl of vinegar once a month.
I clean the coils on the refrigerator once a year.
I put an enzyme cleaner down the kitchen drain once a month.



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It does take 4 gallons to flush the water heater.

