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FROG @ease Sanitizing System for Free Flow Spas: How Prefilled Cartridges Simplify Water Care Every Freeflow Spas model comes ready for the FROG @ease sanitizing system, and understanding how the prefilled cartridge approach actually works makes it much easier to get consistent, predictable results from it over time. Unlike measuring and adding chemicals by hand, the @ease system relies on two cartridges doing the work continuously, with a simple visual cue telling you exactly when something nee … read more