Water Lily® absorbs and retains all oily substances brought throught by the circulating water. It is deposited on the surface of the water in the skimmer and turns colour according to the type of pollution it absorbs; suntan, lotions, pollens, air pollution. Its particular flower shape increases the perimeter where residue concentrates and makes it easy to clean your pool or spa. Disposable, Water Lily® should be changed every 3 to 5 weeks according to how often the pool is used.