Solar Evaporation methods produce the purest salt of the many different commercial salt mining and producing methods. It will produce 99.5% pure salt – and this is the recommended purity level for salt water chlorine generation. When buying salt for your pool or hot tun chlorinator, always look for Solar Evaporation with above 99% purity!

Solar Evaporation is the oldest method of salt production and still is the most environmentally friendly. It has been used since salt crystals were first noticed in trapped pools of sea water. Solar salt production is filling shallow ponds with saltwater where the sun evaporates most of the water. The salt is then gathered by mechanical harvesting machines. Any impurities that may be present are drained off and discarded prior to harvesting.

These salt ponds range from to 40 to 200 acres with a foot-thick floor of salt resulting from years of depositions. During operation salt water flows continuously through these ponds. This is called a saturated brine solution, containing as much salt as it can hold, so pure salt crystallizes out of the solution as the water evaporates. Natural chemical impurities are returned to the salt water source.