SeaKlear AquaPill WinterPill Small WinterPill's all-in-one formula makes winterizing your pool faster and easier than ever! WinterPill clarifies the pool water and helps reduce scaling and staining. WinterPill is enzyme-enhanced and controls non-living organics to control waterline ring and enhance filter performance. Winter Pill's patented pre-measured release delivery system effectively helps maintain clear water during the off-season. WinterPill's concentrated formula can be used with all sanitizers, is compatible with all pool surfaces, and will not affect pool chemistry. Features: Easy-to-use winterizing treatment Prevents scaling and staining Clarifies pool water Improves filter performance and sanitizer efficiency Pre-measured-release delivery system One 2-3/4" Winter Pill treats up to 15,000 gallons of pool water