You want to use salt like that used for a water softener - only make sure it says something like 99.8% pure sodium chloride. It cannot have Iodine or any Anti-Caking additive, Yellow Prussiate of Soda (YPS). I believe "solar salt" may be a clue that it use ok too.
I use Cargill Diamond Crystal Solar salt for water softeners. 99.6% pure. It comes in a fifty pound bag and I got mine from Lowes or Home Depot, about $2.50 (or so) a bag.
To figure how much to get, you can do the math for your gallons (ie: 250 lbs for every 10K gallons of water gives you 3000 ppm salt) or get the bleachcalc program from mwsmith2 (search these forums on the name or bleachcalc) and go to more calcs / Salt Calcs. I am not saying 3000 ppm is best, only it is enough for my poolpilot SWC to operate. Experiment with less and add until it feels best to you. This is one those things easy to add, but draining is the only way to get less. If I remember right (from before the "crash") 6000 ppm is where metal corrosion from salt starts. I think poolsolutions Ben has said tears are 9000 ppm.
Your local pool store can test the salt level for you or you can get a salt testing kit from them or get the poolsolutions ps234 with the salt test or purchase it seperately.
No negatives for an IG pool.
AG pools may have an issue, read here:
http://www.poolforum.com/pf2/showthread.php?t=683
The 4th post from Mark_WATERMAID.
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