1、APPLICATION: Simply place the absorbent sponge ball in your hot tub and pool or spa and it will automatically absorb body oils and lotions. Helps you quickly clean bathtubs, hot tubs, spas and swimming pools, and can also be used to clean bathtubs, kitchen sinks and more. 2、CLEANING: Simply float the sponge ball in the pool or spa for about 30 days until it is saturated. Helps you quickly clean bath scum, grease, lotion and other residue. Makes your cleaning job at the pool and spa much easier. 3、PREMIUM MATERIAL: Scum eliminating ball uses an upgraded sponge material with a whisker like surface so it won't yellow easily. Easy to use and lasting, the scum eliminating ball will make your cleaning easier! 4、EASY TO USE: Scum eliminating ball with reliable sponge material, reusable design and sufficient quantity, you can squeeze the water out of the sponge ball to clean it after use. 5、STRONG RESILIENCE, 4PCS SET: With high elasticity, it will recover elasticity after cleaning. The package includes 4pcs Scum Eliminating balls, in sufficient quantity to meet your actual needs. 4 x Scum Eliminating Ball  Item Type: Scum Eliminating BallMaterial: SpongeWeight: Approx. 25g/ 0.9ozDiameter: Approx. 7.6cm/ 3.0in