Nature 2’s Spa Sanitizer provides spa owners with a real alternative to traditional chlorine and bromine sanitizing systems, using its patented mineral-bed technology to maintain spa health. Spa Sanitizer’s formula improves the look, feel, and smell of spa water by reducing the need for sanitizing chemicals, yet does not compromise the overall health of your spa. Installation is as simple as dropping into the pleats in your spas filter, and you’re done and maintenance is vastly simplified, giving you more time to enjoy your spa rather than looking after it. The Natural Alternative to Chlorine (and Bromine too!) Not for use in spas utilizing Bromine Lasts four months Makes spas easy to manage, halogen-free Improves performance of ozone-equipped spas Assures an odor-free spa Significantly improves look & feel of water Simplifies water balance — it's unaffected by heat 9 out of 10 spa users prefer Nature2 over their old method