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, hot tubs, 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. 1. Save the life of the filters by collecting all the scums, slimes, , and oils right out of the water. This allows the filter to run longer with more efficiency. 2. It is recommended to have two Turtle Oil Absorbing Sponges floating around the water for best results. 3. Absorbs multiple times its weight in oil, slime, grim and other types of scums. 4. All that is needed to be done is to place Oil Absorbing Sponge on top of the water and let it do its job. 5. By absorbing all the scum, no scum lines form on the tiles and/or the walls of the pool/ spa / hot tub. Use Note: Do not use liquid detergent or enzyme solution to clean the product. It speeds up the decomposition of the product and turns it brown. Recommended to wash with water. Size: about 11.5*11.5*3cm/4.53*4.53*1.18inch Color: White Material: sponge Package Contents: 10 * Oil absorbing sponge Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.