Chlorine Cartridge for Pool System: Pool FROG Pac 540C chlorine cartridges are designed for use with the Pool FROG XL PRO System

Superior Swimming Pool Maintenance: Designed to reduce chlorine significantly, this product ensures cleaner, clearer water that's easier on skin and swimsuits

Prefilled Chlorine Cartridge for Convenience: Each chlorine cartridge is prefilled with 6.16 lbs. of Trichlor and dispenses the right amount of chlorine needed for the pool

Cartridge for Convenient Pool Care: This chlorine sanitizer is for use in the Pool FROG XL PRO System with the FROG Mineral Reservoir 40K (sold separately) to support pool maintenance

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