4 Pack Cleaning Balls: You will receive 4 scum absorbing balls, which can effectively absorb grease and other suspended particles. Which have a spherical structure that can increase the contact area with water, and can float on the water surface stably, thus keeping the water clean and clear, and bringing a happier spa experience. High Quality Material: The oil absorbing sponge is made of high quality fabric, which is highly absorbent, soft, lightweight and durable, and can effectively remove pollutants from the swimming pool. The hot tub cleaning accessories are designed in 3D honeycomb shape, can help you continuously absorb residue and grease in the hot tub quickly and effectively. Easy to Use: This hot tub foam cleaner without complicated installation, just one step, put the foam absorbent balls into the bathtub or swimming pool with water, the sponge ball can work automatically. That you will have more time to enjoy the relaxing experience brought by the hot tub and save your