FROG Pac 540C Replacement Chlorine Cartridge for Pool FROG XL PRO Cycler — 6.16 lb Prefilled Trichlor, Easy Twist Installation

The FROG Pac 540C is a prefilled trichlor chlorine cartridge engineered to fit the Pool FROG XL PRO Cycler and deliver consistent, low-maintenance chlorination for residential pools.

Replaceable and ready to use, this FROG Pac 540C cartridge contains a measured 6.16 lb charge of trichlor sanitizer formulated to work with the Pool FROG XL PRO system and FROG mineral reservoirs. It simplifies dosing so owners can maintain clearer, softer water with fewer daily adjustments while the Cycler meters sanitizer into the pool automatically.

How does the FROG Pac 540C keep my pool water balanced?

The cartridge supplies a steady release of stabilized chlorine that the Cycler meters based on your pool’s circulation and the chosen output setting. This predictable feed helps maintain free chlorine levels between weekly adjustments and reduces the peaks and valleys that come from manual dosing.

• Prefilled 6.16 lb trichlor pack calibrated for the XL PRO Cycler
• Works with FROG Mineral Reservoir 40K (sold separately) for combined mineral and chlorine sanitation
• Stabilized trichlor reduces chlorine loss from sunlight

Will it fit my Pool FROG XL PRO Cycler and how easy is installation?

The Pac 540C is designed specifically as a replacement cartridge for the Pool FROG XL PRO Cycler, so fitment is straightforward and tool-free. Swap the old cartridge for the new prefilled unit in minutes to restore consistent sanitizer delivery.

• Directly compatible with Pool FROG XL PRO Cycler cartridge slot
• Prefilled — no measuring, pouring, or handling loose granular chlorine
• Simple twist-and-seat installation in the Cycler housing

How does this cartridge affect comfort, fabrics, and pool care workload?

By providing a steady, lower-dose chlorine output, the Pac 540C helps maintain clearer water that’s gentler on swimwear and skin compared with large, infrequent chlorine shocks. Routine maintenance time is reduced because the Cycler automatically meters sanitizer, so you spend less time adjusting chlorine levels.

• Smoother chlorine delivery can help protect swimsuits and reduce odor compared to erratic dosing
• Compatible with daily automatic meter settings to cut down manual testing and dosing
• Works alongside FROG mineral technology to support softer-feeling water

What should I know about safety, storage, and lifespan?

Handle the prefilled cartridge according to label instructions: keep it dry, out of direct sunlight until installed, and away from children and pets. Cartridge life varies with pool size, bather load, and Cycler setting; check your XL PRO manual for expected runtime and replacement intervals.

• Store in a cool, dry place in original packaging until use
• Follow Pool FROG XL PRO Cycler settings and local pool regulations for safe chlorine levels
• Replace when the Cycler indicates depletion or when sanitizer levels drop

Who is this for: The FROG Pac 540C is intended for residential pool owners using the Pool FROG XL PRO Cycler who want a convenient, pre-measured chlorine cartridge. It’s a good match for homeowners seeking automated, predictable sanitizer delivery, those using FROG mineral systems for softer water, and anyone who prefers cartridge swaps over handling loose chemicals.