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CircuPool SJ-20 Salt Chlorine Generator
CircuPool SJ20 Saltwater Chlorinator System

CircuPool SJ-20 Salt Chlorine Generator

Part Number: SJ20A
Availability: In Stock.
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CircuPool SJ-20, Complete Salt Pool System with 3-Year Limited Warranty, for up to 20,000 gallon pools
Power 0.8 lbs/day
Warranty 3 Year Limited
Rated Lifespan 10000 Hours
Max Capacity 20000 Gallons
Does not require acid to clean the cell!

The CircuPool SJ-20 saltwater chlorine generator provides simple worry-free operation and industry-leading value. Circupool SJ-20 units work with existing pump and filtration systems to reliably supply swimming pools with pure chlorine every day. The CircuPool SJ-20 works at a low salt level and creates a silky soft feeling in pool water to provide the ultimate swimming experience. Max capacity: 20,000 gallons.

Available DIY Adapter Kit for Hayward or Pentair models allows for a simple and quick conversion from Aqua Rite or IntelliChlor models.

The complete 2nd-Generation CircuPool SJ-20 salt chlorine generator system has three main components: the Control Module, the Electrolytic Cell, and the Flow Switch, along with its miscellaneous hardware, cleaning tool, and documentation.


  • Clear Titanium Cell, with a leading 3-Year Limited Warranty.

  • Simple, reliable, and proven. Monitors performance and system status, while operating on the widest salinity range available.

  • Incredibly easy maintenance! No acid is necessary for cleaning the cell.

  • CircuPool products are backed by USA-Based Expert Support & USA-Based Factory Warranty


General FAQ

Rating Snapshot

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Average Customer Ratings


best things for my home
This has been running for a while and I can say this is one of the best things for my home I've bought. It has made everything so much nicer and I went from having to mess with my pool almost every other day to basically nothing. I just wish I would have done this years ago.
Did you find this helpful?  31 of 35 Found Helpful
Reviewed by:  (Verified Buyer)  from Spring, TX on 3/29/2017
Relatively easy
Installation was relatively easy. I really like the clear plastic around the salt cell, which allows for a visual inspection of the titanium plates. I would point out there is no digital read-out on the control panel that tells me ppm of salt, which my previous unit had. I will plan to buy a hand-held electronic device to test salinity with. However, it does let you know when the salinity level is no longer in range, and since its salinity operating range is so broad, maybe it doesn't really matter like on the old ones.
Did you find this helpful?  16 of 19 Found Helpful
Reviewed by:  (Verified Buyer)  from Hattiesburg, MS on 3/28/2017
new system
The generator unit has been keeping the pool clean so no complaints. Wish it told you more specifics, how do I know my salt level isn't too high or low?
Did you find this helpful?  16 of 22 Found Helpful
Reviewed by:  (Verified Buyer)  from Slidell, LA on 11/6/2016
My pool company wanted more than what I paid for this for just the REPLACEMENT CELL!! I like this even better now.
Did you find this helpful?  14 of 18 Found Helpful
Reviewed by:  (Verified Buyer)  from Escondido, CA on 3/1/2017
Looks well built, and the way it works makes it easy to know whether its working or not. However, part of my wishes I got the one with a screen like my neighbor has.
Did you find this helpful?  12 of 16 Found Helpful
Reviewed by:  (Verified Buyer)  from Madera, CA on 6/28/2016
There are no reviews yet
Questions From Customers

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?  64 of 68 Customer(s) found this Answer helpful.
Answer provided by: Nathan (3/8/2017)

Q: How much salt do you need to use to start the salt system?

Asked by: Gary Dulin - 3/25/2018
A: You'll start off by adding roughly 30 lbs of salt per 1000 gallons.
Was this answer helpful?  15 of 20 Customer(s) found this Answer helpful.
Answer provided by: Matt (3/26/2018)

Q: my pool is 12 x 24 with 5 foot depth what size do i need ?

Asked by: chuck - 4/20/2017
A: If your pool is rectangular, those dimensions would make it approximately 10,800 gallons. You always want to oversize so that your equipment does not have to run at full capacity just to keep up. The best practical recommendation is to buy the largest system within your budget, so you will get the longest life out of it as possible and be able to turn it up to a higher level should you need to hand any potential problems in the pool
Was this answer helpful?  14 of 28 Customer(s) found this Answer helpful.
Answer provided by: Charles (4/21/2017)

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?  8 of 13 Customer(s) found this Answer helpful.
Answer provided by: Tom (3/27/2017)

Q: will this salt cell replace a Clearwater LM2 with no pvc changes ?

Asked by: bruce - 9/11/2017
A: While the cell shape is very similar, it is not a perfectly exact match to Zodiac cells. It is usually pretty straightforward process to make the upgrade, and we are also here for support to try and make things as easy as possible. There is often little to no wait when you call: 866-766-5243 (option 2 for support).
Was this answer helpful?  5 of 8 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (9/11/2017)

Q: I have a waterway pump system will this work with it?

Asked by: Alison - 9/17/2017
A: Waterway makes a range of pumps, but as is the case with most other salt chlorinators it is made to work with the existing pump & filter system. If you happen to have an above-ground Waterway pump which uses hoses for plumbing, the best tip for you might be to just get some standard plumbing unions from the hardware store that will let you to connect your hoses to the inlet/outlet ports of the salt chlorinator (which are meant to have PVC pipe glued into them), and you would also want to make sure you secure the cell so it is oriented horizontally when you plumb it in.
Was this answer helpful?  5 of 9 Customer(s) found this Answer helpful.
Answer provided by: Paul (9/18/2017)

Q: I have a small (6000 gallon) fiberglass pool, located in Florida. Is there such a thing as too much when it comes to the size of the chlorinator? For example, will I hurt anything if I choose a SJ-20 versus a SJ-15?

Asked by: CM - 3/13/2018
A: Over-sizing is actually usually recommended. You can turn the system up and down on its controls (and by adjusting how long it runs) so you don't over-chlorinate or under-chlorinate your pool. A larger system just means the equipment last longer because it works less hard every day, plus you'll have more sanitation power should you need it after a storm or pool party, for example.
Was this answer helpful?  5 of 11 Customer(s) found this Answer helpful.
Answer provided by: Chris (3/13/2018)

Q: What size is the pipe, and how and where does the module attach to give the readings?

Asked by: rocky - 3/30/2017
A: The cell is designed to accept standard 2" PVC pipe. It works equally well on pools with 1.5" plumbing, simply use two reducer bushings from your local hardware store. The cell has a cord (see pictures) that plugs in to the bottom of the Control Module. You'll hang the Control Module nearby with your other pool equipment on a wall, post, fence, etc...
Was this answer helpful?  4 of 8 Customer(s) found this Answer helpful.
Answer provided by: David (3/30/2017)

Q: Will this work for a 40000 gallon in ground pool?

Asked by: Marla Glass - 3/31/2018
A: That's a big pool, so at 40,000 gallons, you would want to get the SJ55, or even the RJ60 model. You always want a system that has plenty of extra power, so you can run your equipment less normally, and so you will be able to have extra cleaning power when you need it during pool problems.

Here's some good info about system sizing:
Was this answer helpful?  3 of 6 Customer(s) found this Answer helpful.
Answer provided by: Howard (3/31/2018)

Q: I have a zodiac lm3. 10 years old. No flow can be seen thru filter. Will this one work as a replacement and is that what I need to do? Thanks Mitch

Asked by: Mitch - 6/2/2018
A: Mitch, give us a call (866-766-5243) so we can help you with the details, but the CircuPool SJ models are a popular choice when replacing older Zodiac models. the SJ15 may be a good size if you have a LM3-15 size system, but remember bigger is always better. We'll help you make sure it is sized right.
Was this answer helpful?  1 of 3 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (6/2/2018)

Chlorine Output:

0.8 lbs /day

Manufacturer Warranty:

3 Years Limited*

Manufacturer Rated Lifespan

10,000 hours

Manufacturer Max Capacity:

20,000 gallons


Digital - LED Indicators

Salinity Range:

3000-4000 ppm

Salinity Test:

Yes - Low (No Maximum)


Yes, Reverse Polarity

Warranty Penalty for Self-Install:


Clear Cell:


Boost Mode:

Yes, 24 hours

Winter Mode:


Flow Sensor:

Yes, Independent Flow Switch

O-Rings Included:


Unions Included:


Union Size:

1.5" & 2”

Power Cord Length:


Cell Cord Length:


Cable Connection Type:



22 lbs

Rated Amperage (120V/240V):

0.833A / 0.416A

Weather / UV-Resistance:

Designed for Outdoor Installation and Operation

The CircuPool SJ-20 system is controlled by the Control Module. Featuring a convenient medium size, molded-plastic exterior with a touch keypad and LED indicators to monitor settings and performance.

The control module mounts conveniently on most walls, posts, or supports. Just follow the accompanying instructions and mounting template for screw placements and installation.

The digital LED indicators on your control module will communicate whether or not your system is operating at optimum performance levels, and will otherwise alert you with its LED indicators for potential service issues such as: the pool's salt level is low, the cell needs cleaning, there is insufficient water flow, or it the water has reached winter temperatures. Keypad controls will also give you the ability to increase or decrease chlorine output, or activate a boost (or SuperCL) mode.

For the cell component of your CircuPool SJ-20 unit, it comes equipped with an SJ-20 electrolytic cell in a clear, raised housing. This contains a set of titanium electrode plates that can be removed, as well as a built-in power supply cord.

Thanks to its unique design, the SJ-20 has a reduced need for cleaning mineral deposits that may occur, which makes it one of the few systems that do not require acid for cell cleaning. You can easily remove the mineral deposits with the cleaning wand included in your system’s kit!

This cell also features threaded connections near the head of the cell, so you can quickly access the titanium plates whenever you need to service them, or if you need to take them out for winter. The cell comes with both 2” and 1.5” unions to easily connect to existing return-line PVC plumbing. The clear housing on the cell makes it easy to inspect for both cleaning and function purposes!

Included in the CircuPool SJ-20 parts kit is an instruction manual, 2" and 1.5" plumbing unions, o-rings, mounting hardware, flow switch, and cleaning wand.
Manufacturer 3 Year Limited Warranty for residential use. Most manufacturer chlorine generator warranties are pro-rated. All warranties offered are provided by the relative manufacturer and are limited to the terms and proration they provide. See manufacturer's documentation for a full description of warranty terms and conditions.