Which Salt Should I Buy for Saltwater Pools?
Saltwater pools contain low levels of salt, which is converted through electrolysis in the chlorine generator into sodium hydroxide, hydrogen, and chlorine gas. The chlorine gas then combines with the water to form liquid chlorines (hypochlorous acid and sodium hypochlorite). The chlorine then sanitizes the pool water and prevents algae growth and cloudiness. But which salts are best to use in saltwater pools?
Pool salt is the same chemical composition as table salt (NaCl) but is ground more coarsely to work best in the chlorine generator. It is also sold in bulk and does not contain additives to prevent caking or add iodine. Salt Industries sells two options made by Morton. Both have high purity and are all-natural. They are gentle on skin, hair, and bathing suits.
- A slightly coarser, medium-grade pool salt harvested from saltwater, this choice may take longer to dissolve in the pool water. However, it is the less expensive of the two options.
- This fine-grained pool salt is almost the size of table salt. It will dissolve in the pool’s water in less than three minutes.
Other types of salts are not designed for use in pools and should be avoided. This includes coarse rock salt, table salt, and water softening pellets.
Saltwater pools have salinity levels of 2,500 to 3,500 parts per million, which is lower than human tears (6,000 parts per million) and much lower than the ocean (35,000 parts per million). To reach the correct salt levels for the pool, salt is added based on the current salt level and the gallons of water in the pool. To reach Morton’s recommended level of 3,500 parts per million, visit their online chart to see how many bags of Pool Salt or Professional’s Choice Pool Salt to purchase.
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