APEX P40 Aftermarket Replacement Cell fits Pentair® IntelliChlor® IC40® 520555 Salt Cells | up to 40,000 gallons
APEX P40 Aftermarket Replacement Cell fits Pentair® IntelliChlor® IC40® 520555 Salt Cells | up to 40,000 gallons

APEX P40 Aftermarket Replacement Cell fits Pentair® IntelliChlor® IC40® 520555 Salt Cells | up to 40,000 gallons

Part Number: APX-P11-40R
Availability: Call for more information.
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$989.00 $679.00

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Aftermarket Replacement Salt Cell guaranteed to work with the Pentair IC40 salt chlorine generator. Please note: the APEX P40Cell is not manufactured, endorsed, or sold by Pentair. See below for more information.
Power 1.6 lbs/day
Warranty 2 Year Limited
Max Capacity 40000 Gallons
Separately Replaceable Cell
Enhanced Controls & Display

The APEX P40 aftermarket replacement salt cell compatible with Pentair IntelliChlor® IC-40 models is a great alternative choice for your salt chlorinator system while replacing your old Pentair salt cell. The APEX P40 salt cell makes 1.6 lbs/day of chlorine. This APEX P40 cell has the same length and threads to ensure proper fit and easy replacement of an existing Pentair IntelliChlor IC-40 cell. When replacing your original OEM IC-40 Intellichlor salt cell, satisfaction is guaranteed.

Many users like the APEX P40 aftermarket replacement cell's onboard digital controller which allows you to adjust chlorine output with a tap of a button in small increments, and displays the actual salinity in PPM! This aftermarket replacement cell offers user-friendly controls and an economic price point.

    Guaranteed to fit and work with:
  • Pentair IntelliChlor IC40
  • Pentair Intelli-Chlor 40,000 Gallons
  • All IntellChlor 520556 Power Centers
  • Item IDs: 520555, EC-520555

When replacing an OEM Pentair IC-40 cell, typical installation of the APEX P40 aftermarket replacement salt cells is easy. The plug-and-play replacement process simply involves unscrewing the existing cell from the plumbing, disconnecting it from the power center, and then reconnecting the APEX P40 cell in a similar fashion. Since it can utilize the existing connections for the Pentair IC-40, installation can usually be done in minutes without tools. The APEX P40 cell includes the power cable (standard 14') and extra unions compatible with the Intellichlor models.

Note: The aftermarket cell does not utilize a RS-485 or data connection for integration with automation systems like Pentair Intellitouch, Pentair Easy Touch®, Jandy® AquaLink®, Hayward® AquaLogic® and Hayward ProLogic®

The APEX P40 Cell is not manufactured, endorsed, or sold by Pentair. Neither APEX nor the P40 cell is affiliated with Pentair; the use of manufacturer names, product names, part numbers, or such trademarks herein are included for compatibility designations and informational purposes only.


General FAQ

Rating Snapshot

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Average Customer Ratings


Works perfect
This was a no brainer! It fit right into where the old bad Pentair cell was, and cleared the pool up overnight. My old cell only lasted two years and then left me suddenly with a green pool. Couldn't get help from the pool store that installed it or the manufacturer. This was a fraction of the cost and I did it myself easily. Plus, I love the screen! Will update in a couple months... UPDATE 6/24: Finally had to replace the cell about 5 years later. I didn't know when I first got this but now I was psyched when I learned that I could just replace the cell's "tube" which is dirt cheap since the electronic controls don't have to be replaced. This was absolutely a better cell option.
Did you find this helpful?  89 of 90 Found Helpful
Reviewed by:  from Fort Lauderdale, FL on 4/9/2019
An outstanding company !!! My situation: Like many, I was effected by the unusual freezing temperatures in Texas and the South in Feb 2021. As a result, I needed to replace my salt chlorine generator. My generator was a Pentair Intellichlor model. However, these were nowhere to be found! I'm sure the phenomenon the history books will call COVID-19 was mostly to blame. So, I'm looking for anywhere I can find a replacement. I find a generic model at Discount Salt Pool. I'm concerned the generic replacement will be somehow inferior and I'll regret the purchase. I call the number expecting to get a machine. I speak to a human within 10 seconds. I have an intelligent conversation about this generic replacement. This guy knows his stuff ! OK, I order. The generic replacement is honestly probably superior to the OEM, and it was cheaper. You NEVER see that anymore. An aftermarket replacement that is cheaper AND better. Well, this model is. I call on a Sunday a month later, and again, speak to a HUMAN within 10 seconds. Another intelligent conversation. Guess where I'll order all pool stuff in the future?
Did you find this helpful?  61 of 62 Found Helpful
Reviewed by:  from New Braunfels, TX on 7/29/2021
Actually better than the original
Much better than the original cell I replaced. Received it quickly and I didn't even need to read the instructions, it was easy enough that I removed the old Intellichlor cell and replaced it myself the evening it came in the mail. I especially think that this was a much better choice b/c it has a screen, you have more options for how it runs, and it's been keeping the pool clear running on a lower setting which is great.
Did you find this helpful?  42 of 44 Found Helpful
Reviewed by:  from Tucson, AZ on 4/20/2019
Excellent Product
After using 3 Pentair salt cells in 6 summers, we decided to try this salt cell. The fit was perfect, and I like having the ability to increase the generation by 10% intervals. The cell is working great!
Did you find this helpful?  41 of 44 Found Helpful
Reviewed by:  from Villa Rica, GA on 7/11/2019
Working after I figured it out
After I figured out the the light means it is generating and not a problem, its working fine. I like being able to fine tune it and also to see the salt level.
Did you find this helpful?  37 of 38 Found Helpful
Reviewed by:  (Verified Buyer)  from Niceville on 8/21/2019
There are no reviews yet
Questions From Customers

Q: Will the power box for my Intelichlor I40 work with the Replacement Cell for Intelichlor 40 Generic upgrade?

Asked by: Lady - 6/19/2019
A: Yes, absolutely. This is designed to directly replace the cell and hook right up to your existing Intellichlor Power Supply.
Was this answer helpful?  68 of 74 Customer(s) found this Answer helpful.
Answer provided by: Nathan (6/20/2019)

Q: Why do you think your generic unit is better than the Pentair ic40? tks

Asked by: Robert - 11/16/2019
A: It has significantly higher chlorine output and it has a display screen and actually reads the salinity level.
Was this answer helpful?  40 of 44 Customer(s) found this Answer helpful.
Answer provided by: Larry (11/17/2019)

Q: The generate light is flashing green. What does this mean? All other lights are sold green.

Asked by: beam - 6/12/2019
A: When the system is operational and connected to power, the "Generate" LED light will be lit solidly. During times that the system is currently generating chlorine, the "Generate" LED light blinks (this will be intermittently throughout the day unless you leave it at 100% output).
Was this answer helpful?  18 of 21 Customer(s) found this Answer helpful.
Answer provided by: John (6/13/2019)

Q: Who provides the warranty service on this item? If I buy it and need warranty service do I go through the manufacturer or through

Asked by: Curtis - 10/28/2019
A: You go through us, just call 866-766-5243 ext.2 and we can easily help you troubleshoot it and make sure you get fixed up if needed.
Was this answer helpful?  16 of 19 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (10/29/2019)

Q: does the cell still need to be cleaned and if so how often?

Asked by: Michael Parla - 11/15/2019
A: Yes, all salt cells need to be cleaned eventually. The frequency of cleaning for this cell should be just as much time as your original. The amount of time that actually takes depends on your water chemistry, and on average that could be once ever 6-8 weeks. The LED indicators let you know when though.
Was this answer helpful?  14 of 18 Customer(s) found this Answer helpful.
Answer provided by: Nathan (11/18/2019)

Q: Can I plug this into the pentair easy touch panel? Will it have enough power to run this ?

Asked by: Christa - 6/23/2019
A: It has the same standard Pentair IntelliChlor cord connections, and yes it can be used with the standard Pentair power supply unit. These don't communicate with external controllers or RS485 data connections (though that isn't necessarily needed).
Was this answer helpful?  12 of 17 Customer(s) found this Answer helpful.
Answer provided by: Terry (6/24/2019)

Q: does this have a self cleaning feature?

Asked by: Robert - 11/16/2019
A: Yes, this salt cell’s self-cleaning feature is comparable to the original’s.
Was this answer helpful?  8 of 10 Customer(s) found this Answer helpful.
Answer provided by: Nathan (11/18/2019)

Q: The flow switch has failed on my IC 40 before. Can the flow switch be replaced on this unit, and do you carry the part?

Asked by: Alex - 7/30/2020
A: Yes that's correct, its easy to replace.
Was this answer helpful?  7 of 8 Customer(s) found this Answer helpful.
Answer provided by: Brent (7/31/2020)

Q: Is the manual available on line so I can look at it now?

Asked by: Tyler - 10/11/2019
Was this answer helpful?  5 of 10 Customer(s) found this Answer helpful.
Answer provided by: Discount Salt Pool (10/14/2019)

Q: How does the cell produce so much more power per day (2.1 lbs) than the original pentair unit? Are the comparisons based on equivalent settings?

Asked by: Michael - 1/14/2020
A: Yes, that's an apples to apples comparison. All chlorine output specs are tested and rated based on full output over 24 hours of run time. It was designed as a higher performing cell.
Was this answer helpful?  4 of 5 Customer(s) found this Answer helpful.
Answer provided by: Kyl (1/15/2020)

Chlorine Output:

1.6 lbs/day

Manufacturer Warranty:

2 Years Limited*

Manufacturer Max Capacity:

40,000 gallons


Digital - LED Screen

Salinity Range:

2800-4500 ppm

Salinity Test:

Yes - Displays PPM, High, Low

Flow Sensor:

Yes, Built-in Flow Switch

Clear Cell:



Yes, Reverse Polarity

Boost Mode:

Yes, 24 hours

Winter Mode:


Warranty Penalty for Self-Install:


Weather / UV-Resistance:

Designed for Outdoor Installation and Operation

The APEX P40 controls are mounted on top of the electrolytic cell (separately replaceable). It has a bright LED screen that displays the actual measured salt levels, ten sanitizer output power levels, and LED indicator lights to display if there is an issue with the salt level, water flow, water temperature, or whether the cell requires checking or service. The P40 also includes onboard diagnostics. The controls also have a built-in mechanical flow switch that ensures sufficient water flow for chlorine generation. Under low water temperature conditions, the control's automatic shut-off feature protects the unit and prolongs cell life.
A special feature of the APEX P40 is that when replacement is needed in the future, its electrolytic cell is replaceable separate from the electronics; this can provide significant savings and can greatly add to the lifetime value of the APEX P-Series cells. The APEX P40 aftermarket salt cell has an inline opaque-plastic housing that contains built-in titanium electrode plates, top-mounted electronic controls, a integrated flow switch, and a built-in power supply cord. The aftermarket APEX P40 salt cell has the same threaded connections on the inlet and outlet, to allow for direct replacement of the original OEM Pentair Intelli Chlor IC-40 salt cell and quick access for service or winter removal (if applicable). The threaded connections attach to the existing unions which are glued to the existing return-line PVC plumbing.
Manufacturer 2 Year Limited Warranty for residential use (second year prorated). 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 the manufacturer's documentation for a full description of warranty terms and conditions.