[cstreit]

It depends on your water usage and water hardness. It looks like you have a computerized model. Ours does this as well. You set the water hardness in the computer and it figures out how much water you can run thru before a recharge.

The important bit (and I'd get your instructions) is how often it recharges. If we recharge every night I could go through 80-100lbs of salt in a month. However our "smart system" measures the water usage and ends up recharging every 3-4 days (depending on how much laundry we did). As a result I use 3-4 bags every 3 months. (40# bags). We have about 2.5 people using water in our house for some perspective.

You should also check on your cleaning cycles. Ours does a 10 minute flush during every cleaning cycle. Once everytwo months I put about 1/2 cup bleach in the brine well to sterilize it. Every 3 months I add some "rust out" to flush out the iron buildup.