Is there any iron in the water?
What salt setting or how many minutes is set for the brine refill on the 7000?
If you are running 9 lbs and 33000 capicity on the unit and one person , you could have 1200 gallons on the meter and a defalt day setting of 14 and it should be good.
If there is iron let me know that will change the numbers..
With either gallons or days what will happen is that if you have family over for awhile then the gallons will trip it into a cleaning cycle, while by your self the day counter will most likely over ride it..
Seven day in my view is more when there is Iron in the water, even a little say .6ppm... then there needs to be a shorted time frame.