We can summarize our findings by advising that science proves that all pool salt is clearly not the same. Our independently derived data shows that salts contain differing levels of contaminants such as iron, manganese, copper, nitrates, phosphates, silicates, sulfates, high calcium levels and even heavy metals. In addition to these materials we also found many cases of significant levels of organic contamination that caused chlorine demand and could create problematic conditions. The nature of contamination varied considerably by geographic region and by the way each salt is produced. As we studied salt processing we began to understand that contaminants can be present and attached to the lattice structure of the crystal itself, locked into internal spaces between the crystals or reside on the surface. Experts in salt production informed us that “the impurities cannot be totally removed for pool grade salt no matter how much washing occurs as part of the process”.

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