The Pentair Posi-Chlor 25 takes the Pentair Posi-Chlor 25 g/h replacement cell 811021 as its cell; Australian sellers list it from A$1599.00 as of 31 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your salt chlorinator
Pentair Posi-Chlor 25
Salt chlorinator
Confirmed against Pentair's listConfirmed against Pentair's own compatibility list
Not yours? Change
Takes the 811021 cell
Posi-Chlor 25 g/h replacement cell 811021 · check the code on your old part before ordering.
Cell with screw cap, O-rings, plates and cable; the housing stays in the pipe.
Your salt chlorinator
Salt chlorinator
Confirmed against Pentair's listConfirmed against Pentair's own compatibility list
Takes the 811021
Cell · check the code on your old part.
Cell with screw cap, O-rings, plates and cable; the housing stays in the pipe.
Other Pentair salt chlorinators and their cells
The 811021 fits the Posi-Chlor 25 only. These Pentair models take a different cell:
GenuineGenuine Pentair
$1599.00
Budget Pool Care · 31 OctLowest genuine · Budget Pool Care · checked 31 Oct
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Pentair. Compatible: another brand.Genuine is made by Pentair. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $1599.00
Budget Pool Care. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 2 sellers
AUD, before delivery. Each price shows when it was checked.
Opens Budget Pool Care in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it after about 10,000 hours of running, its design life, Pentair says; sooner if the unit still shows Lack of Salt once the salt level is right and the cell has been cleaned.
After replacing: No reset needed. Switch the unit back on and set the output again.
How to change the cell in your Pentair Posi-Chlor 25
Watch the guide or follow the steps.
No clear video for this part yet. The steps cover it.
- 1Switch the Posi-Chlor and the filter pump off at the power point, and close the valves either side of the cell.
- 2Unscrew the cell's screw cap and lift the electrode plates out of the cell housing.
- 3Fit the new cell with the housing O-ring seated and screw the cap back on.
- 4The new cell comes with its own cable, which is wired to the CELL terminals and the water-sensor terminal (white wire) inside the control unit. This is mains equipment: have your pool shop or an electrician connect it.
- 5Open the valves, start the pump and check for leaks, then switch on and set the production level.
Every number this part goes by
- Retail name:
- 811021
Sellers list any of these; they are the same part.
About your Pentair Posi-Chlor 25
Pentair salt chlorinator — Posi-Chlor salt chlorinator. Its cell is the Posi-Chlor 25 g/h replacement cell 811021, part 811021.
Where the model number is: The model and output are on the label on the power supply or control box near the pump. Switch the chlorinator and pump off at the power point before you touch the cell.
Fits this Pentair model
Pentair1 model
Cell with screw cap, O-rings, plates and cable; the housing stays in the pipe.
Common questions
- Which cell fits the Pentair Posi-Chlor 25?
- The Pentair Posi-Chlor 25 takes the Pentair Posi-Chlor 25 g/h replacement cell 811021. Cell with screw cap, O-rings, plates and cable; the housing stays in the pipe.
- Where can I buy the 811021 in Australia?
- We track 2 Australian sellers for the 811021; the lowest listed price when we last checked was A$1599.00 at Budget Pool Care. Prices are re-checked daily and dated on this page.
- How do I fit the 811021 in a Pentair Posi-Chlor 25?
- 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A worn cell makes too little chlorine, so the water turns green or cloudy, and turning the output up only wears it faster.
- Is there anything to reset afterwards?
- No reset needed. Switch the unit back on and set the output again.
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