What makes a reef aquarium different from a planted or freshwater aquarium? The salt in the water. It adds that extra step of actually mixing up the water before doing a water change. Rest assured that Fritz RPM Salt, which is the salt that is sold by AlgaeBarn, has no such ammonia, nitrate, or phosphate. Along with that, it has all the major and minor elements needed to sustain a reef ecosystem. Fritz RPM also has enhanced calcium, magnesium, and potassium, which allows the water mix to the perfect water chemistry. The water in your aquarium is the base of everything that lives inside of it, and the salt is the base of the water. It is very important to pick the right salt mix! Otherwise, you may find your parameters out of wack and unbalanced and your corals unhappy. This is perfect for growing corals, fish only, and refugia. Not only is Fritz our choice, but it is also used and trusted by many other hobbyists, public aquariums, zoos, and research institutions. This salt is truly premium. It is made with only the highest quality raw materials and is made in the Fritz Aquaritcs facility to ensure great quality. The popularity can attest to how excellent it is. You can trust that Fritz RPM is the best salt and you can trust that AlgaeBarn has picked the best product to sell.