The ideal accessory for any hot tub, spa or pool, this Spa Ball from Canadian Spa helps you keep the water clean and hygienic. The Spa Ball floats on the water surface and soaks up oils and other residues to help keep the spa water clean. When new, the Spa Ball will float on the water surface. As it absorbs oils, greases and other surface residues, it will sink; indicating that it should be replaced. A clear and visual indication of when to clean your water, this Spa Ball will help you stay on top of cleaning and maintenance to ensure a safe and pleasant bathing experience. Features and Benefits Clear Indication - When fresh, the spa ball will float on the water surface. As it absorbs oils and other residue, it will sink to indicate that it should be replaced. Effective Results - Helping to keep your spa or pool hygienic and safe to use, this spa ball will make a useful and necessary addition to your maintenance kit. Specifications Canadian Spa Spa Ball Can be placed in spa filter