I add salt very rarely. Maybe 40# in the past year. I wouldn't worry about the cost of salt. Figure 1 gallon of acid per month during the summer. I can't see how the electric cost would be more than $10/month. Truthfully, you are going to be able to do it cheaper with bleach. But, when I was doing bleach, I had to add .75 gallons every 3 days, without fail. Even then, I was skirting 0.5 Cl. I always had about 0.5 PPM CC, and a slight Cl smell. I don't have any of those problems now with a SWC