The Sterisil 90 or 365 Day Straw – Distilled & MunicipalThe Sterisil Straw delivers powerful treatment though Silver Ion technology with simplicity and consistency. 20x better efficacy than iodine straws Continual waterline treatment guaranteed for 365 days Built in initial shock treatment Clinically proven to kill odor causing bacteria in dental unit waterlines Easy to install in any dental bottle No oxidizers that may damage handpieces or affect amalgam separators Municipal and Distilled formulations