My wife and I use about 75 gallons per day, with 15 gpg hardness and we chose the GE 30,000 grain water softener so we have room to grow. I bought 3 40 lb bags of salt and it says I have 148 days till empty. This was a breeze to install and had extremely soft water in an hour or so. Haven't had any problems so far. I highly recommend this water softener!!