CircuPool SJ40 - User Manual

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Saltwater Chlorination System - Installation and Operation Guide

Models: SJ15 SJ20 SJ40 SJ55

SJ

SJ

Series Salt Systems

Advanced Swimming Pool Sanitation

Questions and Answers

A
adam34Aug 12, 2025
Why is there low or no chlorine residual in my CircuPool SJ40 pool?
- E
  Emily HartmanAug 12, 2025
  If you observe low or no chlorine residual, cloudy water, or a green pool when using CircuPool Water Filtration Systems, the problem could stem from several factors. It may be due to insufficient chlorine output, which can be resolved by increasing the output level, especially with rising temperatures. Another cause could be insufficient run time; increase the run time to at least 1 hour per 10° ambient temperature. Heavy pool use, inclement weather, or organic matter might also be the cause, in which case you should activate SUPER CL MODE or chemically shock the pool. If the cell is dirty, clogged, or has excessive scaling or mineral build-up, remove the cell from plumbing, inspect and clean it. Finally, ensure the unit is active and the power is on.
M
Matthew WalkerAug 16, 2025
What to do if my CircuPool SJ40 Water Filtration Systems system will not turn on?
- R
  Robert BurkeAug 16, 2025
  If your CircuPool Water Filtration System won't turn on and the Power LED is not lit, there are several possible causes. First, verify the settings on your pool timer or controls. It's possible the system has no input power or is connected to the incorrect voltage; have a professional test the power source and ensure the correct connection. Check if the power switch is set to 'Off' and turn it to 'On'. Also, check if the Fuse Reset has tripped and press the reset button on the bottom of the Control Module.
S
Sheila CruzAug 20, 2025
Why is the Power LED flashing and Service LED on in my CircuPool SJ40 Water Filtration Systems?
- R
  robinsoncrystalAug 20, 2025
  If the Power LED is flashing and the Service LED is on for your CircuPool Water Filtration System, it could be due to a few reasons. It could be that the salt level in the pool is low, so test the salinity and add salt if necessary (if it is less than 3500 ppm). The cell might be dirty or clogged, so you should clean it. Or, the water temperature could be low, so turn off the system until the water temperature is above 60°F. Insufficient water flow could also be the problem, so check the pump, filters, and valves for proper operation and make sure the sensor in the cell is clean and that the cell is completely full of water with no air bubbles present.
J
Joshua UnderwoodAug 23, 2025
What to do if there's low chlorine after installing CircuPool SJ40?
- W
  williamscynthiaAug 23, 2025
  If you're experiencing low or no chlorine residual in your pool after a recent installation of CircuPool Water Filtration Systems, consider these potential causes. The water chemistry might not have been balanced before installation; in this case, contact a pool professional to ensure all chemicals are within range and chemically shock the pool if needed. Double-check all connections to ensure the system runs in sync with the circulation pump. Also, the system may be connected to the incorrect voltage; have a professional test the power source and ensure correct connection.
W
walljonathanAug 27, 2025
What to do if Power LED is flashing, Service LED is on, and I can't raise chlorine production in my CircuPool SJ40?
- J
  jonesnicholasAug 27, 2025
  If the Power LED is flashing, the Service LED is on, and you're unable to raise chlorine production with your CircuPool Water Filtration Systems, ensure there is no dirty or clogged cell, cold water, or low salt level. Then, activate SUPER CL mode, then hold down the (+) button until polarity lights flash. Check to see if Service LED stays on, or replace Electrolytic Cell.
J
Jennifer WilliamsAug 31, 2025
Why is my CircuPool Water Filtration Systems leaking water?
- B
  Bryan PottsAug 31, 2025
  If you notice a water leak with your CircuPool Water Filtration System, it could be due to several reasons. The keyed notch on the Cell head may not be fully aligned (or became unaligned); unscrew the cell, carefully align it, and hold the Cell cable in place while screwing the Cell head's cap hand-tight. Another cause could be an O-Ring improperly seated; clean the O-Ring and its channel, ensure no lubricants have been added, and fully seat the O-Ring in its channel before inserting the Cell. The Cell Cap might also be cross-threaded; unscrew the Cell Cap, inspect threads for damage, and ensure that it screws back on without resistance.
J
James LuceroSep 4, 2025
Why does my CircuPool SJ40 Water Filtration Systems cell frequently have mineral buildup?
- R
  Robin KimSep 4, 2025
  If your CircuPool Water Filtration Systems cell frequently has mineral buildup, this is due to imbalanced water chemistry. Ensure that your Saturation Index is at or near zero to avoid damage or premature cell failure.
S
sarabarberSep 7, 2025
Why does my CircuPool SJ40 cell never have mineral buildup?
- W
  wburnsSep 7, 2025
  If your CircuPool Water Filtration Systems cell never or rarely has mineral buildup, the water may be corrosive due to imbalanced water chemistry. Ensure that your Saturation Index is at or near zero, in order to avoid damage or premature cell failure.

Summary

Safety Instructions

General Safety Precautions

General safety precautions and warnings for installation and operation.

Electrical Safety

Guidelines for electrical safety, grounding, and bonding.

Operational Safety

Operational safety guidelines, including water flow, chemical handling, and valve use.

Material Compatibility & Maintenance Safety

Adding Salt

Salt Addition Chart and Procedure

Chart for estimating salt required and procedure for adding salt to the pool.

Salt Properties and Recommendations

Operation

How it Works: Electrolysis

Explanation of how the SJ-Series generates chlorine through electrolysis.

Initial Start Up Procedure

General Operation Factors

Using the Control Module

Control Module Interface

Description of the Control Module's LEDs and their meanings.

Control Module Buttons

Using the Control Module (Continued)

System Operation and Monitoring

Super CL Mode

Maintenance

Expected Maintenance

Cleaning the Electrolytic Cell

Step-by-step guide for removing and cleaning mineral buildup from the Cell.

General Maintenance

Winterizing

Replacing the Cell

Installation

Installation Overview and Guidelines

General guidelines for installing the SJ Series, including plumbing considerations.

System Diagram

Installing the Electrolytic Cell

Cell Placement and Plumbing

Instructions for fitting the Cell into the return line, including pipe measurements and elbows.

Cell Assembly and Sealing

Steps for assembling the Cell into its housing, ensuring a watertight seal.

Installing the Control Module

Control Module Mounting

Wiring and Connections

Instructions for wiring the system, including cell connection, fuse reset, and bonding.

Wiring (Continued)

Wiring to Power Source

Connecting the system to the power source, including voltage checks and typical wiring diagrams.

Variable Speed Pump Integration

Voltage Conversion

Voltage Configuration and Jumper Settings

Instructions for converting the SJ Series between 240V and 120V configurations.

Troubleshooting

Low or No Chlorine Residual

Troubleshooting steps for low or no chlorine, including cloudy or green pool water.

No Chlorine After Installation

Indicator Light Status

Troubleshooting (Continued)

System Not Turning On

Resolving issues where the system does not power on or the Power LED is off.

Unable to Increase Chlorine Production

Water Leaks and Plumbing Issues

Cell Mineral Buildup Issues

CircuPool SJ40 Specifications

General

Brand	CircuPool
Model	SJ40
Category	Water Filtration Systems
Language	English

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