About this item Hot Tub Replacement Cartridges: FROG SmartChlor Cartridges are designed for use with the FROG @ease Floating Sanitizing System; perfect for hot tubs up to 600 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 tub 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 Hot Tub Sanitization: With FROG @ease, you use less chlorine, making the water easier on skin, hair, swimsuits, and your hot tub’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 that’s no mess, no guess and no stress › See more product details