These sponge balls help clean scum, grease, lotion, and other residues in swimming pools, hot tubs, spas, and bathtubs. Reduce cleaning time and effort. [Upgrade Materials] Traditional sponge balls have large pores that can easily turn yellow. Our scum-eliminating balls use upgraded sponge material with whisker-like surfaces to resist yellowing. [Elastic & Washable] These oil-absorbing sponge balls are washable and elastic. Squeeze out water after use to clean them. They quickly return to their original shape for reuse, offering a cost-effective and time-saving solution. [Widely Used] It can be difficult to remove oils, lotions, and residues by hand. These reusable swimming pool filter balls help maintain clean water in pools and spas, reducing the need for frequent water changes. Suitable for use in bathtubs and similar applications. Color: White Material: Sponge Package Contents: 10 x Filter sponge ball Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.