If I can't get the Pool salt at Walmart, they did have Morton salt. I was wondering it the Bright and Solf pellets would be OK to use. The only other ingredient is Sodium Hexametaphosphate at 03% The rest is Sodium Chloride at 99.97%. The Pure solar crystals seem to have some extra dirt in them. At least that is what I found out from using them in my water softener system when I cleaned it out and saw how much dirt was in the bottom of my brine tank. I would think that if the pellets were ok for the softener then it should be good for the pool.