Package content: 4 soft clean sponge balls with a diameter of 7.5cm to meet use and replacement needs. The material is safe, the volume is large enough, the weight is light, it is easy to carry, can be washed, and can be reused. Better absorption: the filter ball has strong adsorption capacity and strong cleaning ability. The surface of the scum sponge is treated with a special process, which can efficiently treat oil, dust, scum and debris without forming a scum line and keep the hot tub clean. Application: The reusable scum sponge ball can be used in swimming pools, bathtubs, spas, kitchens, filter pumps, and aquariums. Sponge outlet, necessary hot tub accessories. : put the descaling ball into a swimming pool or bucket filled with water, and the descaling ball can clean the water by itself. There are no complicated steps when cleaning, just rinse with water and squeeze out the oil, the sponge ball will recover. : put the descaling ball into a swimming pool or bucket filled with water, and the descaling ball can clean the water by itself. There are no complicated steps when cleaning, just rinse with water and squeeze out the oil stains, and the sponge ball will recover. Product description : Size: Diameter 7.5 cm Material: Sponge color Package includes: 4 x Hot Tub Scum Sponge In order to maintain the service life and color of the swimming pool filter sponge ball, please try not to expose it to the sun for a long time. The filter balls have a high dirt holding capacity, allowing them to float freely (occasionally flip) to complete the cleaning of the pool.