The Zorbie Hot Tub Water Bobble floats on the surface of your hot tub water and helps keep your hot tub water clean. It absorbs body oils, suntan lotions, dirt, grime, make-up and lots of other great things that get into your hot tub water. It also helps to reduce hot tub odours and keeps your hot tub fresh and clear. Place the Zorbie in your hot tub (best near the filter). The more stuff it absorbs, the heavier it gets and sinks. When it’s really dirty & sinking, simply throw it away and get a new one. DO NOT squeeze or wring it out! The Zorbie generally lasts about 30 to 90 days.