The Zorbie Water Bobble, removes contaminants off the water surface of your COLDTUB™. Zorbie absorbs body oils, dead skin, suntan lotions, make-up, hair conditioners and other oils from your water. It effectively removes odors and helps keep water clear and fresh. It lasts up to 3 months depending on use. When the Zorbie becomes saturated, you can pro-long the life by rinsing it in fresh water - do not wring it out.