Ocean Salt for Hermit Crabs which is necessary for their survival due to its presence in their natural habitat Contains No Iodine, unlike table salt, as it is harmful to their health Trace Elements and Minerals are also provided in this Hermit Crab Salt Easy to Mix, just use 1/2 cup scoop of salt per gallon of distilled water. Scoop Included Josh’s Frogs Hermit Crab Salt (8 gallons) is a great way to provide saltwater to your pet hermit crabs. It contains all the salt, trace elements, and minerals your pet hermit crabs would acquire from natural salt water. This bag contains 4 cups of salt mix enough to make 8 gallons of quality salt water for your pet hermit crabs How to Use: Mix 1/2 cup Hermit Crab Salt with 1 gallon reverse osmosis or distilled water, and shake until the salt completely dissolves. Add to a pool in your crab’s tank