Astralpool Hurlcon VX6 & E25 Genuine Salt Chlorinator Cell & Electrode - 21905 / 21915

Astralpool Hurlcon VX6 & E25 Genuine Salt Chlorinator Cell & Electrode

This is the genuine Astralpool salt chlorinator cell for VX6 and E25 chlorinators. Choose the complete cell with housing (21905) or the electrode only (21915). 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 Cell Suit?

• Astralpool E25
• Hurlcon / Astralpool VX6, VX6S, VX6T, VX6TL
• Hurlcon 6 Series

It Does Not Suit These — Order These Instead

• VX7 — uses 21906 (complete) or 21916 (electrode)
• VX9 / E35 — uses 21907 or 21917 (buy here)
• VX11 — uses 21908 or 21918
• Viron V18–V45, eQuilibrium EQ18–EQ45, Halo Chlor — use the 12915–12918 range

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

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

The electrode is the plate stack that wears out. The housing is the clear barrel it sits inside. The housing does not wear, it fails. Decide by inspection:

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.
2. Hold the empty housing up to the light. If it is clear, uncracked, not crazed and the sealing faces are smooth, keep it — order the electrode only, 21915.
3. If the housing is cracked, crazed, milky, brittle or weeping at the unions, order the complete cell, 21905. A cracked housing will not seal against a new electrode.

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

• Complete cell: 21905 (supersedes 20905)
• Electrode only: 21915 (supersedes 20915)
• Plates: 7 solid plates
• Plate length: 100mm
• 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 VX6 than in an E25, 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 cell 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 (VX6, VX6S, VX6T, VX6TL) — 3 years
• Fitted to an E-Series chlorinator (E25) — 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, confirmed for VX6, E25 and the rest of the VX / E 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 / 21917 — the VX9 and E35 cell, if you are on the larger model (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

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.

What is the difference between 21905 and 21915?
21905 is the complete cell — electrode plus clear housing. 21915 is the electrode only, with no housing. If your existing housing is sound, 21915 is all you need.

Does the VX6 cell fit an E25?
Yes. The VX6 and E25 use the same cell. Astralpool's E25 is the successor to the Hurlcon VX6 and shares the electrode.

Will this fit a VX7, VX9 or VX11?
No. VX7 uses 21906 / 21916, VX9 and E35 use 21907 / 21917, and VX11 uses 21908 / 21918. Ordering by series number alone is the most common mistake.

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.

How many plates does the VX6 / E25 cell have?
Seven solid plates, 100mm long.

Is this a genuine Astralpool part?
Yes. We are an authorised Astralpool and Fluidra dealer and warranty agent, and this is the genuine cell. 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 21905, Astral 21915, Hurlcon VX6 cell, VX6T cell, E25 chlorinator cell, Astral salt cell electrode, 20905, 20915, genuine Astral chlorinator cell, 7 plate salt cell, Hurlcon 6 Series cell, Astral cell warranty, WWDG SpaPro.