Reusable Scum Disc - Don't throw your sponge 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. Wide Use - Oil-absorbing sponges help the inanimate scum in the swimming pools, , jet baths, massage bathtub and spas. TIP - It is recommended to have two Turtle Oil Absorbing Sponges floating around the water for best results.Absorbs multiple times its weight in oil, slime, grim and other types of scums.