Repackaged instant ocean sea salt Makes 1 gallon Mix with distilled or spring water & allow to sit overnight Hermit Crabs need fresh water & salt water pools both deep enough that they can fully submerge themselves in. Sea sponge’s aren’t really necessary, & they do tend to harbor & grow bacteria, but make sure you provide a way in & out of the pools. Wouldn’t want the crabs to get stuck in there Instant Ocean Sea Salt For Hermit Crabs Makes 1 Gallon