Since you are using potassium chloride you'll have to clean the salt tank every year or two to get rid of the build up in the bottom. Same for any type pelletized salt.
Keep the time set correctly.
If you have any iron in the water you should not be going 13 days between regenerations. Also, if you used the 48K setting to get to 13 days, you are getting very poor salt efficiency.
Depending on your salt efficiency, the 6 lbs./cuft or less will require a higher salt setting than sodium chloride will.