The Seachem Replenish Water Conditioner for Fish Tanks is a proprietary salt blend designed to replenish physiologically relevant minerals lost during reverse osmosis or deionizing filtration. Replenish restores General Hardness (GH) by combining "soft" (sodium, potassium) and "hard" (calcium, magnesium) salts. Mineral content restoration is critical because a complete lack of minerals causes osmotic stress in species whose osmoregulation systems are adapted to a mineralized environment. Severe osmotic stress can cause osmotic shock, which can result in death.
Caution: Causes serious eye irritation, keep out of reach of children, and avoid contact with skin.