Seachem Prime is a complete and concentrated conditioner for both fresh and saltwater aquariums. It is a patented, synergistic blend of different buffers, mineral electrolytes, and other conditioning agents. Seachem Prime removes chlorine, chloramines, and ammonia from tap water making it safe for fish and other aquatic life. It also helps to reduce nitrate, nitrite, and phosphates as well as detoxifying metals. Seachem Prime is available in 100ml, 250ml, 500ml, and 1L sizes.