The AstralPool VX 9T takes the AstralPool VX9 (VX 9T) and E-Series E35 electrode 21917 as its cell; Australian sellers list it from A$865.00 as of 31 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your salt chlorinator
AstralPool VX 9T
Salt chlorinator
Confirmed against AstralPool's listConfirmed against AstralPool's own compatibility list
Not yours? Change
Takes the 21917 cell
VX9 (VX 9T) and E-Series E35 electrode 21917 · check the code on your old part before ordering.
Electrode only: it slides into your existing clear housing and is held by the cell nut. The S model (no time clock) takes the same 9-plate cell, AstralPool's VX parts list shows.
Your salt chlorinator
Salt chlorinator
Confirmed against AstralPool's listConfirmed against AstralPool's own compatibility list
Takes the 21917
Cell · check the code on your old part.
Electrode only: it slides into your existing clear housing and is held by the cell nut. The S model (no time clock) takes the same 9-plate cell, AstralPool's VX parts list shows.
Other AstralPool salt chlorinators that take the 21917
GenuineGenuine AstralPool
$1349.00
Budget Pool Care · 31 OctLowest genuine · Budget Pool Care · checked 31 Oct
CompatibleCompatible option
$865.00
Pool Shop · 31 OctPool Shop · checked 31 Oct
Check sellerCheck seller details
Genuine: made by AstralPool. Compatible: another brand.Genuine is made by AstralPool. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $865.00
Pool Shop. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Compare 4 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
2 sellers
Opens Pool Shop in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it when the controller keeps showing low salt, no flow or low output after the salt level has been checked and the cell cleaned, AstralPool says; check the cell for calcium every fortnight.
After replacing: No reset needed. After fitting, run the pump, switch the chlorinator on and set the output again; the low-salt or no-flow warning should clear once water is flowing through the new cell.
How to change the cell in your AstralPool VX 9T
Watch the guide or follow the steps.
- 1Turn the chlorinator off at the power point, turn the filter pump off and close the valves either side of the cell if you have them.
- 2Disconnect the cell lead: on the VX and Viron undo the wing nuts (the blue sensor wire goes back on the blue terminal); on the E-Series and eQuilibrium unplug the cell terminal cap; on the Halo unclip the end cap and unplug the colour-coded wires.
- 3Unscrew the cell nut (retaining ring) and draw the old electrode out of the clear housing. If the housing is cracked, crazed or weeping, fit a complete cell instead.
- 4Slide the new electrode in with its O-ring seated, screw the nut back on firmly by hand and reconnect the lead the way it came off.
- 5Open the valves, start the pump and check for leaks, then switch the chlorinator back on and set the output.
Every number this part goes by
- Retail name:
- 20917
- Retail name:
- 21917
Sellers list any of these; they are the same part.
About your AstralPool VX 9T
AstralPool salt chlorinator — VX salt chlorinator (Hurlcon / AstralPool). Its cell is the VX9 (VX 9T) and E-Series E35 electrode 21917, part 21917.
Other cells the maker lists for this salt chlorinator: AstralPool VX9 (VX 9T) and E-Series E35 complete cell 21907. Complete cell (electrode and clear housing): buy this if your housing is cracked, crazed or leaking. If the housing is sound, the electrode on its own is enough.
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 these 2 AstralPool models
AstralPool2 models
E-Series E35. Electrode only: it slides into your existing clear housing and is held by the cell nut. Australian AstralPool parts sellers list the VX9 cell for the E35.
VX 9T. Electrode only: it slides into your existing clear housing and is held by the cell nut. The S model (no time clock) takes the same 9-plate cell, AstralPool's VX parts list shows.
Common questions
- Which cell fits the AstralPool VX 9T?
- The AstralPool VX 9T takes the AstralPool VX9 (VX 9T) and E-Series E35 electrode 21917. Electrode only: it slides into your existing clear housing and is held by the cell nut. The S model (no time clock) takes the same 9-plate cell, AstralPool's VX parts list shows.
- Where can I buy the 21917 in Australia?
- We track 4 Australian sellers for the 21917; the lowest listed price when we last checked was A$865.00 at Pool Shop. Prices are re-checked daily and dated on this page.
- How do I fit the 21917 in an AstralPool VX 9T?
- 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. After fitting, run the pump, switch the chlorinator on and set the output again; the low-salt or no-flow warning should clear once water is flowing through the new cell.
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