High-Quality Sponge Material: Traditional sponge balls have large pores and are prone to yellowing. Our upgraded spa descaling balls are not only made of high-quality sponge material but also feature a whisker-like shape. This improved sponge material effectively removes dirt, body oil, foam, and other debris, absorbing even the finest impurities to the maximum. They won't yellow or fall apart easily, ensuring your pool or spa stays clean and tidy! Absorbs Grease and All Grime: Our spa descaling balls can absorb over 41 times their own weight in inanimate dirt. These reusable descaling balls effectively absorb and remove grease, debris, pollen, and other contaminants from pools and spas through capillary action and tension. Elastic and Reusable: The improved sponge material absorbs contaminants without dissolving. The oil-absorbing sponge balls are washable and flexible. After use, you can squeeze out the water and wash them. They quickly return to their original shape for easy cleaning, saving time and affordability. A must-have for all pool owners. Easy to use: Simply place the foam balls on your pool sponge. Their floating design allows them to move effortlessly, cleaning all surfaces without any manual labor. Once full, simply squeeze out the excess oil, rinse the sponge, and reuse it. Gentle cleaning: Unlike traditional pool chemicals, these floating filter balls remove dirt naturally through physical absorption without introducing harsh chemicals into the water. They provide an environmentally friendly way to keep pool and spa water crystal clear and safe for users. Color: White. Material: Sponge. Size: Approximately 3 inches. Package Contents: 8 cleaning balls. Only the above package contents are included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.