Premier is a conditioner specifically designed for the planted aquarium. It removes chlorine and chloramines while adding potassium. Premier is non-acidic and will not impact pH. Use at start-up and whenever adding or replacing water. Premier is a concentrated solution of potassium thiosulfate which removes both chlorine and chloramines. Although a thiosulfate-based conditioner is not recommended for saltwater aquaria because of the ammonia produced when it reacts with chloramines, it is perfect for the planted aquarium. The ammonia produced from chloramine by Premier is predominantly in the ammonium form, and is thus rapidly scavenged by plants. It also serves as a minor source of potassium.