For future reference on the type of salt to use, you want the purest form of salt you can get. Some salt contains YSP which I've been told can cause stains. Last I checked at HD and Lowe's locally, none of the salt contained it, but there was one bag of 'solar salt' produced in Mexico that didn't say anything. Just be careful and know what you are adding into your pool. Obviously, it will be mostly sodium chloride, but just watch what else is attached.

I found one HD in town (San Diego) that carries pool salt. It is 100% pure salt in small eraser sized pieces. Breaks down instantly on water contact. $4.50 for a #40 bag. Nice price to boot. I walked accross the parking lot to a pool supply store, who wanted $12.00 for the same thing.