Product Information
Description
Pentair 520973 IntelliChlor COMSYS-8 Commercial Salt Chlorine Generator
Four cells. Eight pounds. One smart system.
The Pentair 520973 IntelliChlor COMSYS-8 Commercial Salt Chlorine Generator (PST-520973) is Pentair's four-cell commercial salt system, sized to sanitize light commercial pools up to 40,000 gallons and built to deliver 8 lbs of pure chlorine every 24 hours. You get one primary cell, three secondary cells, matching primary and secondary power centers, and a pre-plumbed manifold, all wired for 220 VAC and ready to tie into your ORP/pH controller. When a single residential IC60 cannot keep up with bather load or volume, the COMSYS-8 scales the same proven IntelliChlor technology to a commercial duty cycle.
Four IntelliChlor Cells, One Manifold
The COMSYS-8 ties one primary IC60-class cell and three secondary cells into a single pre-plumbed manifold, so the whole sanitization array installs as one assembly on the equipment pad. Each cell produces up to 2 lbs of pure chlorine in 24 hours, and the four work in parallel to deliver a combined 8 lbs per day. If a secondary cell goes offline for service, the remaining cells keep producing without interruption, so the pool never drops to zero free chlorine while you wait on parts.
Pre-Wired 220 VAC Power Centers
One primary and three secondary power centers ship mounted on PVC backboards and prewired for 220 VAC, so a licensed pool electrician lands one feed instead of building the harness from scratch. The primary center handles control and diagnostics, the secondaries drive their cells, and the whole bank reports cell life, salt, output percent, and water flow on the IntelliChlor color status displays. Push-button controls keep service simple even after a five-year tech rotation.
Daily Performance Data Capture
Every cell logs production settings, hours of operation, chlorine output, cell-cleaning cycles, salt readings, and water-temperature averages. Cell-life tracking communicates remaining operating hours in real time, so the service tech knows which cell to rotate before it nuisance-trips the pool. Automatic on-time cycling reverses polarity to strip calcium and scale, and a low-temperature shut-off protects the electrodes when the pool drops below the safe operating range.
Who It's For
Light Commercial Pools
Sized for commercial venues up to 40,000 gallons, hotels, condos, and HOA pools where a single residential cell cannot keep up with bather load.
Aquatic and Therapy Facilities
Drives consistent free chlorine through long pump runs and heavy use without the chemical-feed downtime of liquid bleach or tab systems.
Water Park Feature Pools
Holds sanitizer levels stable on splash pads, lazy rivers, and feature pools that run extended hours and high turnover.
Salt Conversion Retrofits
Drops in as the sanitization stage when a commercial operator converts off liquid chlorine or cal hypo to a salt-generation program.
Why PST Customers Pick This
8 lbs Chlorine Per Day
Four cells running in parallel deliver up to 8 lbs of pure chlorine every 24 hours, enough for sustained sanitization on 40,000-gallon commercial loads.
Redundant Cell Operation
If a secondary cell drops offline for service or end-of-life, the remaining cells keep producing so the pool never goes unsanitized.
Pre-Plumbed Manifold
The four cells ship on a single manifold, which cuts pad install time and removes the guesswork of building the plumbing tree on site.
Real-Time Cell Life
Each cell reports remaining hours of operation on its display, so you rotate cells on a planned schedule instead of after an emergency call.
Self-Cleaning Electrodes
On-time reverse polarity cycling strips calcium and scale off the titanium blades, extending usable cell life under hard-water conditions.
Push-Button Service Access
Bright LED indicators and push-button controls let a tech check salt, output, and fault codes at the pad without an interface laptop.
Installation Notice
The COMSYS-8 power centers wire to a 220 VAC commercial feed and must be installed, bonded, and grounded by a licensed pool electrician per NEC 680. The system also requires an external ORP/pH controller, which is sold separately, to regulate output and protect bathers from over or under sanitization. Salt must be held between 3,000 and 4,000 ppm before energizing the cells, low salt damages the titanium electrodes and voids the warranty.
Full Specifications
Frequently Asked Questions
What is the difference between the COMSYS-8 (520973) and a residential IC60 (521105)?
The residential IC60 is a single cell rated for pools up to 60,000 gallons producing roughly 2 lbs of chlorine per day. The COMSYS-8 is a four-cell commercial array, one primary plus three secondary cells with matching power centers and a pre-plumbed manifold, producing 8 lbs of chlorine per day for commercial duty cycles up to 40,000 gallons. The commercial system also requires an external ORP/pH controller, the residential IC60 does not.
What pool size is the COMSYS-8 rated for, and what salt level does it need?
The 520973 is sized for commercial pools up to 40,000 gallons. Keep salt between 3,000 and 4,000 ppm, with 3,400 ppm a good operating target. Below 2,700 ppm the cells begin to starve and the electrodes wear out faster than rated.
Why does the COMSYS-8 require an external ORP/pH controller?
Commercial pools have to regulate sanitization automatically against bather load and pH drift. The COMSYS-8 produces chlorine, but an external ORP/pH controller reads water chemistry and modulates output so you stay in compliance with health-department free-chlorine and pH limits. Pentair's Acu-Trol commercial chemical controllers are designed to pair with this system.
What happens if one of the secondary cells fails?
The array is built to keep producing. If a secondary cell or its power center drops offline, the remaining primary and secondary cells keep generating chlorine without interruption. The faulted cell reports the issue on its diagnostic display, so the service tech can rotate that cell on a scheduled visit instead of taking the pool down.
Can a pool owner or operator install the COMSYS-8 themselves?
No. The COMSYS-8 is a commercial installation. The four power centers wire to a 220 VAC feed and the bonding and grounding must meet NEC 680, which requires a licensed pool electrician. The manifold and plumbing tie-in should be installed by a commercial pool contractor, and the ORP/pH controller pairing should be commissioned by a service technician. PST will not warranty units installed outside of code.
How long do the cells last and what is the warranty?
Each IntelliChlor cell is rated for 10,000 hours of operation under normal conditions, which translates to several seasons on most commercial pump schedules. Pentair backs the 520973 with a 1-year limited manufacturer warranty, registered through PST as an authorized Pentair dealer.
Does the COMSYS-8 work with Pentair IntelliCenter or EasyTouch?
The COMSYS-8 is a commercial product and ties into a commercial ORP/pH controller rather than the residential automation stack. If your facility runs Pentair Acu-Trol or a comparable commercial chemical controller, the COMSYS-8 integrates directly. IntelliCenter and EasyTouch are intended for residential IntelliChlor cells like the IC40 and IC60.
Order the IntelliChlor COMSYS-8 From PST
Authorized Pentair dealer. PST ships the 520973 commercial system with the full Pentair manufacturer warranty registered through PST Pool Supplies.
Additional Info
| Category | Parts Spa Parts Spa Electrical |
| SKU | PST-520973 |
| MPN | 520973 |
| Manufacturer | Pentair |
| Weight | 0.0 lb |
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