AS long as the salt is at least 99.5% pure and has no additives for removing iron or cleaning the water softener it is fine to use. I use solar salt because it dissolves almost as fast as pool salt, which has smaller crystals. You can even use pellets which tent to be 99.8% pure but they take a bit longer to dissolve. You do NOT want to use food grade salt because the anti-caking agent they put in it to keep it from clumping contains iron and can stain your pool. The main difference between pool salt and softener salt is the size of the crystals but I find that pool salt tends to cake into a large brick in the bag in the humidity here in Florida so it really doesn't dissovle any faster than the larger crystal salt!
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