· Swim Spa Replacement Cartridges: FROG SmartChlor Cartridges are designed for use with the FROG @ease Floating Sanitizing System; perfect for swim spas up to 3000 gallons· Self-Regulating Water Treatment: SmartChlor Cartridges require no maintenance or monitoring; each cartridge lasts 3 to 4 weeks depending on the size of your spa and how often it is used· Cartridges Support Less Chlorine Use: SmartChlor is a patented chlorine formula that keeps a consistent, low level of chlorine at all times for continuous crystal clear water· Swim Spa Sanitization: With FROG @ease, you use up to 75%* less chlorine, making the water easier on skin, swimsuits and your swim spa’s surfaces; patented Mineral Technology sanitizes water and helps keep pH balanced· Water Care Expertise: FROG has more than 25 years of experience making water care easier & keeping pool, hot tub and swim spa water sanitized; FROG’s patented Mineral Technology and prefilled cartridges create cleaner, clearer, softer water