Salt is salt, right? Turns out the answer is no. There are multiple different kinds of salt available, depending on its intended usage. And it's imperative for your pool and your health that you use the right kind of salt when adding salt to your saltwater swimming pool.
It is imperative that you use only sodium chloride (NaCL) that is 99% pure. This is commonly available at most pool stores or hardware store.
Do not use rock salt, salt with more than 1% yellow prussiate of soda, salt with more than 1% anti-caking additives.
DO NOT USE IODIZED SALT.
To add salt turn the swimming pool filter on and add salt directly into the pool. Use a brush to dissolve and disperse salt throughout swimming pool. A pool vacuum will serve the same purposes.
Run the pump for at least 24 hours using the main drain for suction. If you don't have a main drain, use the pool vacuum.
Do not add salt through your skimmer; add directly into the swimming pool and brush to dissolve.
The only way to remove salt from a pool is to drain the salty water out of the pool and replace it with fresh water. Since draining a vinyl liner pool is never recommended unless you are replacing the swimming pool liner, we suggest draining a small portion of water a time and then adding fresh water to the pool. Repeat this process until the salty water is diluted enough.
Can't get enough? Here are some additional resources about saltwater swimming pools.