There are various kinds of water softener salt that you could purchase. The 3 most often used types are evaporated, stone and solar salts. The way the system performs is dependent on the kind that you use. There is not one that's generally advocated over another for general use. The variables in your scenario will come in to play, like the kind of unit you have, the hardness of the water and the availability in the region. Evaporated salts are a number of the purest grades available. They're usually crystallized and purified from brine. This will be done in a production plant comparable to the kind that processes table salts.
Rock salts are taken from undercover by a mining process. You can find very distinct mining methods used, but basically, the idea will be to blast away and after that remove the mineral deposits embedded inside the levels of the world. These are big ponds of really concentrated seawater, which is left to evaporate, leaving behind the salts which are then washed and thoroughly dried. A consideration in selecting the right kind for the system is the solubility. Solubility is the rate wherein something dissolves. In case of the softening system, the dissolution rate may have a big impact on not only how well the water is treated, but also just how long your system will last.
Evaporated water softener salt will be going to be somewhat less affordable than the other choices due to the solubility. Solar salts have an adequate solubility and are middle range on the pricing scale. Rock salt will be going to be the most affordable of the 3 options, but bear in mind that in addition, it has the least solubility, which suggests it might be harder on your system. If you're unsure of the type of water softener salt is needed, you may operate a test at home with a complete hardness testing kit. The more mineral content, like magnesium, calcium and a wide range of other, the harder your water may be. This could be hard on the plumbing as it may result in build up and corrosion of piping. It could also be difficult on surface areas since the nutrients are most likely to cause a movie or build-up that may only be removed with severe cleansers and a fair amount of scrubbing. You must always read the producer's instructions for the specific unit to see what kind of water softener salt they recommend.