Zodiac W20750 Nature2 SPA Stick Mineral Sanitizer<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Mineral cartridge W20750 for hot tubs and spas</li><li>The only EPA-approved no-chlorine or bromine sanitizer system when used with Nature2 Cense</li><li>Fits inside the filter cartridge for easy installation</li><li>Keep your hot tub and spa free from harmful bacteria</li><li>Reduces need for harsh chemicals; less skin irritation</li><li>Combine with Nature2 Cense® for EPA-recognized sanitization</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41U7FC6uGmL.jpg" noproxy>