jfreak53,
One gallon of water will be fully saturated with 3 lbs of salt. Regardless of the salt’s form (crystal, solar, pellet) fully saturated brine cannot dissolve additional salt.
For efficiency, 1 CuFt (ft3) of softener media can be easily regenerated to 85% of its maximum capacity with 3 gallons of water and 9 lbs* of salt. That last 15% will easily require twice the volume of brine!
Example: A salt efficient 4ft3 softener would therefore consume 12 gallons of water and 36 lbs of salt per regeneration.
If that 4ft3 softener’s brine refill cycle fills the brine tank with more than 12 gallons of water, it will consume more salt than necessary to efficiently regenerate the media bed. This is one reason why Russ (Buckeye Hydro) and I frown on overfilling the brine tank with salt.
There are several reasons for excessive brine refill levels but frequently it’s due to incorrectly programed Brine Refill timing. Typical brine refill rates are controlled to 1/2 gallon per minute. So, that 4ft3 softener’s brine refill setting would be 24 minutes (12 gallons/.5 GPM)
BTW* The salt efficiency number is closer to 8 lbs per ft3 but that requires Chinese math to calculate the associated water volume requirements. Who’s got time for that?
Well...I do! It’s actually 32 lbs and 10.66667 Gallons per regeneration with 21.33333 minutes of brine refill. Now you know why I used 9 lbs!
Finally, Sam's Club price in my area is currently less than $7.00/44lbs for Morton Pellets. YMMV.