With such a small pool I'm wondering why you wanted a salt system but that's not a problem. I hope it didn't cost you a bundle, though. Once you get it working, however, I'll bet you love it. I've never been able to cost-justify it myself but I've "kicked the tires" at least a dozen times!

If your water is 4' deep (water, not pool) then you have 13,500 gallons. To calculate volume, first use high school geometry to get the cubic footage and multiply THAT by 7.48 to get gallons. If the water is 3.5' deep then the 11,500 estimate is close.

Usually a one-time mistake like using dry acid won't do much harm, but I'm not the SWG expert here. They will certainly give you better advice.