Hikari Usa AHK72337 Ultimate Water Conditioner for Aquarium, 0.5-Gallon

Ultimate is the world's first full-function water conditioner. With everything you need in one bottle to maintain a superior environment for your aquatic pets. For new setups ultimate instantly ages water allowing you to enjoy your pets in action quicker without fear of the negative impact of toxic chloramine, ammonia, chlorine, heavy metals or nitrite.