Spa Ball Hot Tub Scum Sponge

The Spa Ball sits in the spa filter box and acts like a sponge to absorb oil and other residues from the water surface to help achieve crystal clear water. 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. Also helps to reduce foam build up and spa odours.