Just because you have lost resin does not mean the unit will use more salt than it use to. Some of the reasons for using more salt are: an adjustment was made to the amount of refill, an adjustment was made to the meter wheel causing a regen sooner, the brine valve is not seating properly dripping water into the brine tank between regens. To check this, simply remove the brine line from the valve and see if it drips. A leak in the house will cause more regens which will use more salt. I hope this helps.