There are a variety of different salts on the market that are safe to use in your pools and spas. What is most important, is knowing which ones NOT to use or if you should choose to use one other than a “standard” salt how it will affect your pool or spa.
You should NOT use ordinary table salt, rock salt and ice-melt as these contain anti-caking agents and other additives and impurities which can damage the electrode plates of the chlorinator, so avoid these.
Dead Sea Salt/Minerals are very popular with pools and spas for the mineral benefits they provide. While they are okay to use, the minerals change the conductive properties of the water. Why does this matter? The power supply gauges the amount of salt in the water by the measurement of voltage passing through the cell. Dead Sea Minerals raise the conductive properties of the water allowing a higher voltage reading to pass through the cell. The higher voltage reading causes the Saltron Mini to think there is more salt in the water than there is and it will light up the “High Salt” LED. When the system shows a high salt reading, it causes a lot of owners to think their salt is too high when their salt is too low or at the right level.
It is best to use straight sodium chloride because there is no additives or minerals.