[REUSABLE SCUM DISC] - Don't throw your hot tub sponge scum away! When it gets bogged down with muck, simply squeeze out the oil, rinse out the sponge, and use it again. [ IMPROVE FILTRATION SYSTEM] - By absorbing inanimate scum and lotion/oil, the sponge helps to reduce the load on the filtration system and filter, maximizing its service life, minimizing maintenance costs and saving you time. [EASY USE] - Just throw in the oil-absorbing sponge and let the filter pump run for a while, let them float freely (occasionally flip) to complete the cleaning of the pool.By absorbing all the scum, no scum lines form on the tiles and/or the walls of the pool/ spa / hot tub. [WIDE USE]- Oil-absorbing sponges help eliminate the inanimate scum in the swimming pools, hot tubs, jet baths, massage bathtub and spas. [TIP] - It is recommended to have two Oil Absorbing Sponges floating around the water for best results.Absorbs multiple times its weight in oil, slime, grim and other types of scums. It is