Just throw it in the spa (best when used near the filter). The more stuff it absorbs, the heavier it gets and sinks. When it’s really dirty & sinking, simply throw it away. Lasts about 30 to 90 days.
DO NOT SQUEEZE OR WRING OUT!
The original Zorbie does a great job absorbing body oils, suntan lotions, make-up, dirt grime and lots of other stuff that gets into your hot tub water.