The Pentair 523735 PLUS40 Salt Chlorine Generator Cell is a genuine OEM replacement designed for pools up to 40,000 gallons. It replaces the IntelliChlor IC40 (520555) cell and delivers reliable, high-output chlorine production to keep your pool water clean, clear, and comfortable.

Key Features

• Genuine OEM replacement salt cell for PLUS40 systems

• Direct replacement for IntelliChlor IC40 (520555)

• Suitable for pools up to 40,000 gallons

• Produces a steady supply of pure chlorine via electrolysis

• Eliminates the need for handling and storing traditional chlorine

• Long-life titanium blades with corrosion-resistant coating

• Designed for consistent sanitization and reduced maintenance

• Simple installation with compatible control units

• Cell only – control box/power center sold separately

Product Overview

The Pentair 523735 PLUS40 Salt Chlorine Generator Cell provides dependable, high-output sanitation for mid-to-large sized pools. Engineered as a direct replacement for the IntelliChlor IC40 (520555), it uses the proven electrolysis process to convert dissolved salt into pure chlorine, keeping pool water safe, sparkling, and gentle on skin and eyes.

Constructed with heavy-duty titanium blades coated for durability, the PLUS40 cell is built to withstand harsh pool conditions and deliver years of consistent performance. Its compatibility with existing Pentair salt systems allows for quick, hassle-free installation, making it an ideal choice for replacing a worn or expired IC40 cell without upgrading the entire system.

This listing includes the salt cell only, perfect for direct replacement in compatible systems.

Enjoy Cleaner, Clearer, and Silkier Pool Water

The Pentair 523735 PLUS40 Salt Chlorine Generator Cell is a direct replacement for the 520555 model, designed for pools up to 40,000 gallons. It offers enhanced serviceability, accuracy, and value, featuring a modular design, improved diagnostics, and seamless integration with Pentair automation systems.

Key Bullet Points:

• Direct Replacement for 520555: Seamlessly replaces the Pentair IntelliChlor IC40 cell, ensuring compatibility with existing systems.

• Designed for Pools Up to 40,000 Gallons: Ideal for large residential in-ground pools, providing efficient chlorine generation.

• Modular Design for Enhanced Serviceability: Features a modular construction that simplifies maintenance and sensor replacements, reducing service time by over 50%.

• Redesigned Conductivity Sensor: Provides more accurate salt level readings, achieving 98% accuracy compared to laboratory-grade salinity meters.

• Easy-to-Read LCD/LED Interface: Offers over 20 built-in diagnostics and warnings for optimal performance monitoring.

• Acid Cleaning Kit Included: Facilitates routine maintenance and prolongs cell life.

• Seamless Integration with Pentair Automation Systems: Compatible with IntelliChlor Power Center and Pentair automation systems for enhanced control.

• Alternative to Traditional Chlorine Handling: Eliminates the need for buying, handling, storing, and carrying chlorine, reducing chemical exposure and associated risks.

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Key Features

• Genuine Pentair part, supplied under manufacturer part number 523735.
• Pool capacity: 40K gallons.
• Output rated to a maximum pool volume — undersizing shortens cell life.
• Ships from our US warehouse with tracking on dispatch.

Specifications

• Brand: Pentair
• Manufacturer part number: 523735
• Category: Salt Chlorine Generators
• Condition: New
• Pool capacity: 40K gallons
• UPC / GTIN: 788379918507
• Shipping weight: 3 lb

Frequently Asked Questions

Is the 523735 a genuine Pentair part?

Yes. The 523735 is a Pentair part supplied under that manufacturer part number. It is not a generic substitute.

How long does a salt cell last?

Salt cells typically last three to seven years. Life depends on run hours, water temperature and keeping salt within the manufacturer's range. Low chlorine output at a correct salt reading usually means the plates are worn.

What salt level does the system need?

Most residential systems run between 3,000 and 3,500 ppm. Too little salt reduces output and stresses the cell; too much can trigger a fault and accelerate corrosion of nearby metal.

Can I use a salt system with any pool surface?

Salt systems work with most surfaces, but soft stone coping, untreated natural stone and some heater components are sensitive to salt. Confirm your heater has a cupro-nickel or compatible heat exchanger.

Why has chlorine output dropped?

The usual causes are a worn cell, scale on the plates, low salt, or cold water. Most systems reduce output below roughly 60F by design. Inspect the plates for white scale before replacing the cell.

How do I confirm this part fits my equipment?

Check the part number stamped on the component you are replacing, or find it on the parts schematic in your owner's manual. If the number differs or is unreadable, send us your equipment model and serial number and we will verify fitment before you order.

How quickly does this ship?

In-stock items ship from our US warehouse on business days. You will receive tracking by email once the order leaves the warehouse.

Can I return it if I ordered the wrong part?

Unopened, uninstalled items can be returned within 30 days. Equipment that has been installed or plumbed cannot be returned, so confirm fitment before installation.

Is this covered by a warranty?

Manufacturer warranty terms vary by brand and product. Warranty claims generally require proof of purchase and, on installed equipment, evidence of professional installation.