When placed in a clear pool or spa, it eliminates the formation of scum lines. Absorbs oils and lotions, thereby reducing foaming and prolongs filter life. Capable of absorbing up to 40 times its weight in body oils and lotions. When one side is scummy, flip over and use the other side. When Scumbug is dirty, clean when saturated, squeeze out, clean and reuse. Also assists in removing scum in your hot tub and swimming pool.