21917 - Astralpool Hurlcon VX9 & E35 Genuine Salt Chlorinator Electrode - Internal Only

Astralpool Hurlcon VX9 & E35 Genuine Salt Chlorinator Electrode, Internal Only 21917

This is the genuine Astralpool salt chlorinator electrode for VX9 and E35 chlorinators. This listing is the electrode only, part 21917, the plate stack supplied without a housing. If your housing is cracked, crazed or weeping, order the complete cell, 21907 instead (buy here). Supplied by an authorised Astralpool / Fluidra dealer and warranty agent, not an aftermarket copy.

• We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
• Shipped from VIC, NSW, WA, QLD

Which Chlorinators Does This Suit?

• Astralpool E35
• Hurlcon / Astralpool VX9, VX9S, VX9T, VX9TL
• Hurlcon 9 Series

It Does Not Suit These, Order These Instead

• VX6 / E25: complete cell 21905 (buy here) or electrode 21915 (buy here)
• VX7: complete cell 21906 (buy here) or electrode 21916 (buy here)
• VX11: complete cell 21908 (buy here) or electrode 21918 (buy here)
• Viron / EQ / Halo 18g: complete cell 12905 (buy here) or electrode 12915 (buy here)
• Viron / EQ / Halo 25g: complete cell 12906 (buy here) or electrode 12916 (buy here)
• Viron / EQ / Halo 35g: complete cell 12907 (buy here) or electrode SP12917 (buy here)
• Viron / EQ / Halo 45g: complete cell 12908F (buy here) or electrode 12918 (buy here)

See the full range of genuine Astralpool and Zodiac chlorinator cells and electrodes.

Electrode Only or Complete Cell? (rule CELL-1.0)

This listing is the electrode only, 21917: the plate stack on its own, supplied without a housing. The electrode is the part that wears out. The housing is the clear barrel it sits inside, and it does not wear, it fails. Check yours before you order:

1. Unscrew the cell nut and withdraw the electrode. Look at the plates. Flaking, bare grey titanium, or heavy pitting means the electrode is finished and this is the part you need.
2. Hold the empty housing up to the light. If it is clear, uncracked, not crazed and the sealing faces are smooth, keep it. This electrode is all you need.
3. If the housing is cracked, crazed, milky, brittle or weeping at the unions, do not order this electrode on its own. A cracked housing will not seal against a new electrode. Order the complete cell, 21907 instead (buy here).

Replace the cell o-ring either way. It is a few dollars and it is the usual cause of a leak after a cell change.

Specifications

• Part number: 21917 (supersedes 20917)
• Supplied as: electrode only, no housing included
• Complete cell version: 21907 (buy here)
• Plates: 9 solid plates
• Plate length: 150mm
• Type: Self-cleaning, reverse-polarity
• Brand: Astralpool (formerly Hurlcon), a Fluidra brand

Chlorine output is set by the chlorinator's power supply, not by the electrode alone. The same cell produces a different gram-per-hour figure in a VX9 than in an E35, which is why published output figures for this part vary between sellers. Match on chlorinator model, not on a gram rating.

Warranty: 3 Years on VX, 2 Years on E-Series

It is the same physical part either way, but Astralpool warrants it differently depending on which chlorinator it is fitted to. Per the current Astralpool express warranty schedule, effective 1 February 2026:

• Fitted to a VX chlorinator (VX9, VX9S, VX9T, VX9TL), 3 years
• Fitted to an E-Series chlorinator (E35), 2 years

Most sellers quote a single flat figure for this part. That is not what the manufacturer's schedule actually says.

Warranty Conditions Worth Knowing

• It must be bought from a Fluidra Authorised Dealer. Astralpool's express warranty only applies to product purchased from an authorised dealer. We are one. A cell bought from an unauthorised online seller may not be covered at all, which is worth weighing against a cheaper listing elsewhere.
• Cover starts 30 days after the date of purchase to allow for installation.
• Residential single-dwelling pools. Cells used at hotels, swim schools, rehabilitation centres, apartment or townhouse complexes and other multi-dwelling or commercial sites are covered for 1 year.
• Water chemistry is a condition. Cover assumes water balanced to AS 3633, pH held between 7.2 and 7.8, and free chlorine not exceeding 4ppm. Damage from scaling or corrosion caused by out-of-balance water is excluded. Keep your test results.
• Register the product with myFluidra using the serial number and proof of purchase.

Full details on our warranty information page.

Why the Warranty Is Better Here

• We are an authorised Astralpool, Hurlcon and Fluidra dealer and warranty agent, so buying from us satisfies the authorised-dealer condition on its own.
• Claims are assessed and handled by us in-house, not bounced to a supplier who bounces you to the manufacturer.
• Our team includes ex-Astralpool and ex-Hurlcon technicians who built and serviced these chlorinators.

Genuine Only, And Why That Matters

The replacement cell market is full of aftermarket, generic and copy electrodes, often listed so they look like the real thing. Non-genuine cells typically use a lighter titanium substrate and a lower-grade mixed-metal-oxide coating, which wears through early and drops chlorine output well before the promised life. Fitting a non-genuine part can also affect cover on the chlorinator itself. If a genuine cell is advertised well below the going rate, it is worth asking what is actually being sent.

Related Parts

• 78104: cell body o-ring for the Astralpool VX / E-Series / Viron range. Replace whenever the cell is opened (buy here)
• 70390: cell nut, E-Series / VX / Viron / eQuilibrium (buy here)
• 70570: external clear cell body, if you need the housing on its own. Check the fitment list on that page against your model (buy here)
• 70391: cell cap, VX / E-Series / EQ / Filtrite (buy here)
• 21907: the complete cell, electrode and housing together, for when the housing is cracked or crazed (buy here)

When to Replace

Replace the electrode when the chlorinator reports low output or a low-salt fault that persists after the salt level is confirmed correct, when the plates show bare titanium or flaking coating, or when chlorine production has clearly fallen off with balanced water. Scale on the plates is not failure. A scaled cell often recovers after cleaning. Check for scale before condemning a cell, particularly in hard-water areas.

Frequently Asked Questions

Does this include the housing?
No. 21917 is the electrode only, the plate stack with no housing. If your housing is cracked, crazed or milky, order the complete cell, 21907, instead.

Does the VX9 cell fit an E35?
Yes. The VX9 and E35 use the same cell. Astralpool's E35 is the successor to the Hurlcon VX9 and shares the electrode.

Will this fit a VX6, VX7 or VX11?
No. VX6 and E25 use 21905 or 21915, VX7 uses 21906 or 21916, and VX11 uses 21908 or 21918. Ordering by series number alone is the most common mistake.

How many plates does the VX9 / E35 cell have?
Nine solid plates, 150mm long.

How long is the warranty on this cell?
Three years if it is fitted to a VX chlorinator, two years if it is fitted to an E-Series chlorinator, per Astralpool's express warranty schedule effective 1 February 2026. Cover begins 30 days after purchase. Commercial and multi-dwelling installations are covered for one year.

Does the warranty apply no matter where I buy the cell?
No. Astralpool's express warranty only applies to product purchased from a Fluidra Authorised Dealer. We are an authorised dealer and warranty agent, so buying here satisfies that condition.

My cell arrived with a grey surround, not clear. Is it genuine?
Yes. Astralpool changed the surround and genuine cells now ship in either black or grey. The current housing design fits both old and new chlorinator bodies.

Is this a genuine Astralpool part?
Yes. We are an authorised Astralpool and Fluidra dealer and warranty agent, and this is the genuine part. We do not sell aftermarket or copy electrodes.

Manufacturer Catalogues, Diagrams & Part Numbers

Need exploded views, spare part numbers, product numbers or diagrams? See the manufacturer catalogue: Astralpool Catalogue 2026

Before ordering: confirm this part is correct for your equipment. Use the catalogue above, seek professional assistance, or contact us with photos of your existing part, model details, serial numbers and any labels. As with all products, this must be diagnosed and fitted by a qualified and experienced person.

Common search terms: Astralpool 21917, electrode only, no housing, Hurlcon VX9 cell, VX9T cell, E35 chlorinator cell, Hurlcon 9 Series cell, 9 plate salt cell, genuine Astral chlorinator cell, WWDG SpaPro.