Re: Where to buy the salt
You can get salt at most hardware stores and chains and some grocery stores! (The Publix grocery chain in my area carries Morton Pool salt and it's the cheapest I've found for pool salt @ about $6/40 lb bag.)
You can also use water softener pellets that have NO additves for keeping the water softener clean or for iron. these are ususally the purest salt at 99.9% pure but are the slowest to dissolve. (about $5 for a 40 lb bag)
Solar salt is fine also, large crystals of 99.5% purity (I've found it for about $4.50/ 40 lb bag)...dissolves faster than pellets but not as fast as pool salt (smallest sized crystals and usually also 99.5% purity)
Retired pool store and commercial pool maintenance guy.
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