For water treatment for use of electrolyzer. This salt came from Mediterranean Sea where concentration is 3,5%. This means that every m3 of seawater contains 35 kg of salt. However for use with our electrolyzer we use 5-10 times lower concentration. Using sea salt for water treatment significantly reduces the need for other chemicals and also have regenerative effects on your skin. Maintain pH 7,5 in your pool. Lower pH increases the corrosive effect of salt water and reduces lifespan of electrodes.