Description: Product name: Pool scum balls (4 packs), single diameter: 3 inches (about 7.62 cm) Floating property: Because scum balls are made of sponge material and are designed with appropriate density, scum balls can float on the water surface, which is convenient for free movement in the pool, so as to more effectively absorb and filter impurities in the water Filtration and descaling: The porous structure of the sponge material can absorb impurities such as oil, dirt, and scum in the water to keep the pool clean Reusable: After cleaning, scum balls can recover their adsorption capacity, so that they can be reused Application scenarios: scum balls are suitable for various types of swimming pools, including home swimming pools, public swimming pools, etc., and can effectively remove impurities such as oil and dirt in the swimming pool. It is also suitable for cleaning hot tub, which can absorb oil and scum in the bathtub to keep the bathtub water clean and hygienic Package Includes: 4pool scumballs Note: Please allow slightly errors 1-2cm differences due to manual measurement.