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CircuPool SJ-40 Salt Chlorine Generator
CircuPool SJ40 Saltwater Chlorinator System

CircuPool SJ-40 Salt Chlorine Generator

34 Review(s)
Answered Questions
Availability: In Stock.
Part Number: SJ40NR
$989.00
Add SJ55 to Cart for $1 More
CircuPool SJ-40, Complete Salt Pool System with 5-Year Limited Warranty, for up to 40,000 gallon pools
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Quick Specs View Detailed Specs
Power: 1.6 lbs/day
5 Year Limited Warranty
10000 Hours Rated Lifespan
40000 Gallons Max Capacity
Does not require acid to clean the cell!

The CircuPool SJ-40 saltwater chlorine generator balances advanced technology with simple worry-free operation. The SJ-40 works with existing pump and filtration systems to reliably supply the swimming pool with pure chlorine, every day. The CircuPool SJ-40 uses a low salt level and makes the pool water silky soft to provide the ultimate swimming experience.

Easy DIY Hayward / Pentair Adapter Kit available for simple and quick conversion from Aqua Rite / IntelliChlor models

The complete CircuPool SJ-40 salt system has two main components: the Control Module, and the Electrolytic Cell, along with its miscellaneous hardware and documentation.  

From CircuPool:
CircuPool SJ-40 Electronic Chlorine Generators deliver the ultimate in simplicity and reliability for your swimming pool. The SJ-40 automatically keeps your pool sparkling-clean, providing luxurious pool water that is kind to the eyes, skin, and hair while completely eliminating the need for chlorine, shock, and algaecide. No other salt system is as durable, user-friendly, and easy to operate.Guaranteed to out-perform and out-last systems that cost much more.


  • Long cell lifespan and leading 5-Year Limited Warranty.
  • Simple, Proven, Reliable. Monitors performance & salinity level - works on the widest available salinity range.
  • Easy maintenance, no acid required to clean cell.

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Q & A

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Q: what is the difference between SJ & the RJ systems?

Asked by: Bill - 3/6/2017
A: Great question. Beside the main differences in power and lifespan, here are a few of the things that set them apart once they are in your hands:

The SJ models are very simple, easy-to-use systems. They have status lights that verify the unit is working, tell you at what power level it is set, and whether you need to clean the cell or add salt to the pool. Because it is simple there is less to think about, it is particularly low maintenance (no acid is required to clean the cell), and it is also less expensive.

The RJ and RJ+ models are the flagship systems. They are more powerful and longer lasting. They have a digital screen and touch keypad, giving you more control and diagnostics. It displays the salinity level in real time, calculates the running average, displays the water temperature, and displays the electronic performance levels of the cell so you can see exactly how things are working. The power levels on the RJ models can be turned up and down in smaller increments. RJ models also synchronize more easily with variable-speed pumps if you plan to upgrade.

So the SJ gives you simplicity and a huge value, and the RJ gives you top of the line performance and control.
Was this answer helpful?  28 of 29 Customer(s) found this Answer helpful.
Answer provided by: Nathan (3/8/2017)
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Q: If I install the SJ-40 system myself will it affect the warranty. ?

Asked by: derek - 7/1/2017
A: No, unlike some other brands there is no warranty penalty for self installations.
Was this answer helpful?  12 of 13 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (7/1/2017)
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Q: We have a 22,000 gallons pool- do we choose SJ20 or SJ40?

Asked by: Philip - 6/21/2017
A: You always want to have plenty of extra capacity, so the SJ40. You can always go bigger as well. Here is a little more info about system sizing:
https://discountsaltpool.com/What-Size-Salt-Pool-System-Is-Right-For-Me
Was this answer helpful?  7 of 8 Customer(s) found this Answer helpful.
Answer provided by: Nathan (6/22/2017)
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Q: Does the SJ40 have a built in timer?

Asked by: Dave - 5/18/2017
A: No, like most systems it is designed to be hooked up to the same circuit as the pump so they turn on and off together, which for most people means an existing external timer, pool controller, or switch. You can get a timer cheap at the hardware store if needed.
Was this answer helpful?  6 of 7 Customer(s) found this Answer helpful.
Answer provided by: Tim (5/18/2017)
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Q: I have an above ground pool and my pump uses 110v power, will this work for me?

Asked by: Linda - 3/27/2017
A: Yes, this system can work with either 220v or 110v power. It is set at the factory to accept 220v, which is most common for pools. However, it is made so you can easily change it to accept 110v by following the printed directions. Unlike a motor, it won't work any better or worse on either voltage, you only want to match what your pump uses so they can work on the same circuit together.
Was this answer helpful?  5 of 6 Customer(s) found this Answer helpful.
Answer provided by: Tom (3/27/2017)
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Q: I have a variable speed pump and I am concerned about the minimum flow rate required for this unit. Does this unit have a flow rate sensor that shuts the unit off if the flow rate is below 30gpm? I'm not sure what my flow rate is at low RPM, but I want to make sure this unit will operate.

Asked by: Ken - 12/21/2017
A: To use this model with a variable speed pump, you would want to put it on a timer and coordinate it's run time with the pumps programmed schedule. Alternatively, you may want to look at the RJ-Series models, which use a flow switch that makes it more simple to use with a variable speed pump.
Was this answer helpful?  5 of 7 Customer(s) found this Answer helpful.
Answer provided by: Tim (12/22/2017)
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Q: What all pool pumps is this salt generator compatible with?

Asked by: jessica - 6/16/2017
A: Saltwater chlorine generators are typically able to work with whatever model pool pump and filter system you already have! You simply add this in addition to your other equipment, after the existing pump and filter in the return plumbing line.
Was this answer helpful?  3 of 4 Customer(s) found this Answer helpful.
Answer provided by: Kevin (6/16/2017)
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Q: What is the center to center distance on the vertical inlet and outlet fittings? (looking to replace ESC 36)

Asked by: Profkanz - 8/31/2017
A: For the SJ-Series, the center to center distance of the ports of the Cell Housing are approximately 5 ½" apart.
Was this answer helpful?  3 of 4 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (9/1/2017)
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Q: Does the SJ40 have a built in timer?

Asked by: Dave - 5/18/2017
A: 15 Amp timers can be found cheap at the hardware store. However, if your pump uses 15 amps or more, you will need to find a 20 amp or larger timer. Those are not so cheap at the hardware store. I found a 20 amp day/night timer for a reasonable price $35 online. It allows you to divide the time the pump is on between day and night (2/4/6/8/10 or 12 hours for day and night) so that the water doesn't sit still so long.
Was this answer helpful?  2 of 3 Customer(s) found this Answer helpful.
Answer provided by: Brian (8/2/2017)
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Q: Does this product connect with existing plumbing to replace a compupool cpsc36 without having to redo plumbing or use an adapter kit?

Asked by: KC - 9/17/2017
A: The CircuPool SJ models look similar, but they are actually different enough in shape that it wouldn't directly connect to a Compu Pool CPSC model. However, you CAN connect a CircuPool RJ model to your old CPSC unions using the available Vertical Installation Kit, which makes things very easy. You can see that here:

https://www.discountsaltpool.com/CircuPool-Vertical-Installation-Kit_p_112.html
Was this answer helpful?  1 of 2 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (9/18/2017)
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