My cabinet softener finally failed a slow and painful death.
Just the two of us all the kids are gone, but 3 full bathrooms.
Our old system was 48,000 grain, and was set to regenerate once a week.
Doubt if we use as much as 75 gallons of water apiece/ day.
I had water tested, we are on city water.
iron = maganese <.5 ppb>lead = 0
Max flow = 5 secs per gallon