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Also question is, what kind of salt is used in a saltwater pool?
The preferred salt is an evaporated, granulated, food quality, NON-iodized salt. Avoid using salt with anti-caking agents like sodium ferrocyanide, also known as Yellow Prussiate of Soda (YPS). These cause some discoloration of fittings and pool surface finishes. DO NOT use calcium chloride.
can you use salt in any pool?
The granulated salt used in a saltwater pool can be as simple as regular table salt, but not the iodized version. A pool that has no salts present in the water needs about 50 pounds of salt added per 2,000 gallons of pool water. The best practice is to test the water before and after adding salt using salt test strips.
Good Thing Salt is Cheap! Well, yes and no. It's more often labeled as “pool salt,” which is perfectly fine to use in your hot tub. It's chemically the same thing as table salt, but it's a coarser grind to work better in a chlorine or bromine generator. And you can buy it in bulk, which will save you a lot of money.