Salt chlorinators are the workhorses of Perth pools. They produce chlorine continuously from salt in the water, keeping your pool sanitised without you having to add chemicals daily. But they don't last forever — and when they fail, your pool can turn green surprisingly fast.
How Long Do Salt Chlorinator Cells Last?
A typical salt cell lasts 3–7 years, depending on usage, water chemistry, and how well it's maintained. Some premium cells claim longer life, but in my experience across Perth, 5 years is a good average.
The cell itself is what produces chlorine. It contains metal plates (usually titanium coated with precious metals) that generate chlorine through electrolysis. Over time, this coating wears away, and output drops.
Warning Signs Your Cell Is Failing
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1
Low or Zero Chlorine Output
The most obvious sign. If your chlorinator shows it's running but your pool chlorine levels are consistently low, the cell is probably worn out. Modern units display output percentage — if yours has dropped significantly from when it was new, that's your answer.
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2
"Check Cell" or "Low Salt" Errors
These error codes often appear when a cell is failing. Before assuming it's the cell, check your actual salt level with a proper test (not just the unit's reading). If salt is fine but errors persist, the cell's ability to sense and produce is compromised.
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3
Heavy Scaling on the Plates
Remove the cell and inspect it. Heavy white calcium buildup on the plates reduces efficiency. Some scaling is normal and can be cleaned with diluted hydrochloric acid, but if the plates are heavily coated or the coating is flaking off, the cell is at end of life.
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4
Erratic Output
If output fluctuates wildly — producing well one day and nothing the next — that's often a sign of failing plates or a connection issue within the cell.
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5
Pool Keeps Going Green
If you're having repeated green pool issues despite "running" your chlorinator, and other factors (stabiliser, pH, phosphates) are fine, the cell probably isn't producing what it claims to be.
Before Replacing: Things to Check
Not every chlorinator issue means you need a new cell. Before spending $500–900 on a replacement, verify:
- Salt level — Test with drops or strips, not the unit's sensor. Most chlorinators need 3,000–6,000ppm salt.
- Flow rate — Ensure your pump is running properly and the filter isn't clogged. Low flow triggers safety shutoffs.
- Cell cleanliness — A dirty cell produces less. Clean it with acid according to manufacturer instructions.
- Stabiliser level — If your stabiliser (cyanuric acid) is too high, chlorine is bound up and ineffective — but the cell might be fine.
- Control board — Sometimes the issue is the electronics, not the cell. A tech can diagnose this.
Cell vs. Full Unit Replacement
Chlorinator cells are replaceable — you don't always need to replace the entire unit. If your control box is working fine and just the cell is worn, you can buy a replacement cell that fits your system.
However, if your unit is 10+ years old and the control board is also showing issues, it often makes more sense to replace the whole system. Modern chlorinators are more efficient, have better diagnostics, and may qualify for warranty support.
Not Sure What's Wrong?
I offer free on-site diagnosis for chlorinator issues across Perth's Northern Suburbs. I'll test your system properly and tell you exactly what needs fixing.
Equipment Repair Call Josh: 0401 908 929Extending Cell Life
Want to get the most out of your current cell? Here's what helps:
- Maintain proper water chemistry — Balanced pH (7.2–7.6) and calcium hardness (200–400ppm) reduce scaling.
- Clean the cell regularly — Inspect every 3–6 months. Light scaling can be cleaned; heavy scaling accelerates wear.
- Don't over-chlorinate — Running at 100% output constantly wears the cell faster than running at 60–70%.
- Ensure adequate flow — Poor flow makes the cell work harder to produce the same chlorine.
What Does Replacement Cost?
Replacement cells in Perth typically run $500–900 depending on brand and quality. Generic cells are cheaper but may not last as long. I recommend sticking with name-brand cells (Zodiac, Davey, Hayward, Astral) for reliability.
Full unit replacement ranges from $1,200–$2,500 installed, depending on capacity and features.
If your chlorinator is playing up and you want a straight answer on whether it needs replacing, give me a call on 0401 908 929. I'll diagnose it properly and give you an honest recommendation.