These sponge balls can help you quickly clean the scum, grease, lotion, and other residues in swimming pools, hot tubs, spas, and bathtubs Reduce the cost and time of cleaning. [Upgrade Materials]There are large pores on the of traditional sponge balls, which makes them easy to become yellow. Our scum-eliminating balls use an upgraded sponge material with whisker-like surfaces so that they do not easily go yellow. [Elastic & Washable]Our washable oil-absorbing sponge balls are washable and elastic. You can squeeze the water out of the sponge balls and clean them after use. They will quickly return to their shape for your next use, and are time-saving, and affordable. [Widely Used]It is difficult for us to handle those unpleasant dregs, lotion, and oil stains by hand. These reusable swimming pool filter balls can help you keep the swimming pool and spa clean and avoid frequent water changes. It can also be widely used to clean bathtubs, , etc Colour:White Material:sponge Package Contents: 10 x filter sponge ball Only the above package content, other products are not included. Note: Light reflection 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.