Salt water Inspired by nature, salt electrolysis systems generate chlorine from salt Na Cl (sodium chlorid) dissolved in the water. The salt needed for it to work only has to be added once to the pool at a concentration of 2-4 g/l (kg/m3), which is 10 times less than that of seawater This system avoids the risks involved in transport, handling and dosing large quantities of a dangerous water treatment chemicals.