Pentair IntelliChlor Plus40 Salt Cell Replacement — IC40 Plus for 40,000‑Gallon Pools, Drop‑In Compatibility

Pentair's 523735-EC IntelliChlor Plus40 (IC40 Plus) is a direct-replacement salt cell engineered to produce chlorine for pools up to 40,000 gallons without changing plumbing or control equipment.

This replacement salt cell fits existing Pentair IntelliChlor installations and restores automated chlorine production so you can avoid buying, storing, and handling traditional chlorine. Built as a drop-in upgrade for EC-520555 models, the IC40 Plus regenerates sanitizing chlorine at a rated output while remaining compatible with Pentair power centers and automation systems. The unit replaces worn or underperforming cells quickly and keeps pool chemistry automated and consistent when installed according to manufacturer guidance.

How does the Pentair IC40 Plus replace my old salt cell?

Installation is straightforward: the IC40 Plus is designed as a physical and electrical match to the EC-520555 IntelliChlor cell, so it connects to your existing cell housing and control wiring without altering plumbing. You simply remove the old cell, insert the replacement, and reconnect the harness to restore operation.

• Drop-in form factor fits same housing and mount points
• No new plumbing or adapter pieces required
• Compatible with existing IntelliChlor Power Center
• Quick swap reduces pool downtime

What sanitizing capacity can I expect from this replacement cell?

The IC40 Plus is rated for pools up to 40,000 gallons and is engineered to deliver a measurable daily chlorine output at full capacity. Actual runtime and chlorine production vary with pool size, water temperature, and user settings, but the cell is sized to support large residential and small commercial pools within the specified volume.

• Rated service capacity: up to 40,000 gallons
• Designed chlorine generation matching Pentair performance curves
• Performance depends on salt level and cell usage settings
• Suitable for seasonal or year-round automated sanitizing

Will this cell work with my current Pentair controls and automation?

Yes—the IC40 Plus is compatible with existing IntelliChlor Power Centers and integrates with Pentair automation systems. That compatibility means you retain remote controls, scheduling, and automation features already set in your pool’s control system without reprogramming or additional hardware.

• Designed for plug-and-play connection with IntelliChlor power centers
• Maintains compatibility with Pentair automation setups
• No extra interface modules required for standard installations
• Preserves existing system settings and schedules

What maintenance and operational tips help maximize cell life?

Regularly inspect the cell for scale buildup, maintain recommended salt concentrations, and follow scheduled cleaning procedures to keep output steady and extend service life. Proper winter care and avoiding high-iron or low-salt conditions will prevent premature wear and reduce service interruptions.

• Keep pool salt within Pentair’s recommended range
• Inspect and clean cell plates periodically to remove scale
• Replace the cell when output declines beyond adjustment
• Follow Pentair troubleshooting and seasonal care guidance

Who is this for: The Pentair 523735-EC IntelliChlor Plus40 replacement salt cell is intended for pool owners and service professionals who already run a Pentair IntelliChlor system and need a reliable, drop-in replacement to restore automated chlorine production for pools up to 40,000 gallons. It’s ideal for those who want to avoid handling liquid or granular chlorine, maintain existing Pentair automation features, and minimize installation complexity by using a cell designed to match the original EC-520555 specifications.