Phosphates are the source of many pool care problems, like murky water and poor water quality. Nature² Spring contains lanthanum, a natural, non-toxic phosphate eliminator that significantly reduces the amount of phosphates in the pool. With Nature² Spring's concentrated delivery system, one application covers an entire swimming season of three consecutive months. Nature² Spring is naturally safe for your family and the environment while providing months of stress-free pool care and an all-around healthier swimming experience.