The Frog® @ease® floating sanitizer system is another supplemental way of administering sanitization. If you have ever felt that your hot tub is too much work, this is the right product for you. There are two cartridges that make up the sanitizer system. One is filled with minerals and the other with "Smartchlor". This creates fresh silky water with much less odor, and makes it much easier to maintain as a whole. The system will know when more sanitizer is needed and automatically deliver it. It will also flip over when it runs out, telling you to refill the Smartchlor cartridge on bottom.