Seachem Prime is a complete and concentrated conditioner for both fresh and saltwater aquariums. It removes chlorine, chloramine, and ammonia from tap water and detoxifies any heavy metals found in the water. It also promotes the production and regeneration of the natural slime coat. Seachem Prime is available in sizes of 100ml, 250ml, 500ml, and 1L. The 250ml size provides up to 50 gallons of treatment. Seachem Prime is safe for all aquarium inhabitants and is easily dosed with a capful based on the size of the tank.