Sodium Chloride, used for Salt Water Chlorine Generators. It usually has a smaller crystal size than water softener solar salt and costs about twice as much. Ordinary water softener solar salt or pellets that have a purity of at least 99.5% and do not have any additives for cleaning water softeners or removing iron are fine to use in your pool and are what most manufacturers of SWGs recommend! The only advantage to pool salt is that it dissolves slightly faster. Do not use food grade salt in a pool under any circumstances. Food grade salt contains yellow prussiate of soda (sodium ferrocyanide) as an anti-caking ingredient and that can cause iron staining in your pool.
