Makes tap water safe for Hermit Crabs by removing chlorine and chloramines while adding beneficial electrolytes and calcium.Use Zoo Med Hermit Crab Salt Water Conditioner (Part 2) in a second bowl of water to add essential sea salts for your Hermit Crabs. Directions for use with drinking water:Add 2 drops to each cup (8 fl. oz.) of water. Measure amount of water in your crab water dish and adjust dosage (drops) accordingly. Use every time water is changed.