Re: Best salt to add and place to buy?
Goldline Controls says that solar salt or salt pellets that are 99.5% pure salt and that do not contain additives such as iron removers (red out) or water softener cleaners are fine. You don't want potasium chloride. You want sodium chloride.
Pellets will take the longest to dissolve but also seem to have a higher purity. Solar salt is usually largish crystals and will dissolve a lot faster. Morten pool salt is much smaller crystals but similar to their solar. It dissolves a bit faster than their solar salt.
Diamond crystal pool salt is the smallest crystals that I have seen (almost like table salt) but also the most expensive. It dissolves very fast.
With any of them brushing will help them dissolve.
I have found pool salt at sevaral hardware stores in my area and at 2 different grocery store chains (Winn Dixie and Publix). The grocery stores have been the cheapest price and the salt is usually with the water softener salt.
I have used all of the above in my pool and I look for the cheapest price since they are all sodium chloride! Interesting thing....many of the pool stores in my area that I hve been to don't carry pool salt but they do carry either Mineral Springs (Bioguard) or Salt Water Magic (NaturalChemisty)---both of which are very pricey and IMHO, totally unnecessary!
Retired pool store and commercial pool maintenance guy.
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