Inside a Salt Cell: How It Makes Chlorine
That clear tube on your pool plumbing is quietly making your chlorine for you. It is called a salt cell. For Frisco and North Dallas pool owners with salt systems, here is what is actually happening inside that tube, and why a flashing inspect cell light so often gets misread.
Inside the cell are metal plates with a special coating. Pool water with dissolved salt, plain sodium chloride, flows between them, and a gentle electric current runs across those plates. That is electrolysis. It splits the salt and releases chlorine gas into the water, and in the water that chlorine becomes hypochlorous acid, the very same sanitizer that does the work in any clean pool.
Why Scale Slows a Salt Cell Down
Over time, calcium from the water crusts onto the plates like scale in a kettle. That crust blocks the plates and chlorine output falls. That is why a flashing inspect cell light or a low salt warning often means scale on the plates or a cell that is simply getting old, not always low salt.
So cells get opened, inspected, and cleaned the maker's way, carefully. Chasing it at home with the wrong mix can wreck the coating. This is a job for your tech. Even a well-kept cell wears out after a few years of making chlorine. Clean plates, honest output. That is the whole job of a salt cell.
Key Takeaways
A salt cell makes chlorine by electrolysis: an electric current across coated plates splits dissolved salt in the water, and the chlorine released becomes hypochlorous acid, the same sanitizer at work in any clean pool.
Calcium scale crusts onto the plates over time like scale in a kettle, blocking them and dropping chlorine output.
A flashing inspect cell light or a low salt warning often means scaled plates or an aging cell, not always low salt.
Cells should be opened, inspected, and cleaned the maker's way; the wrong cleaning mix at home can wreck the plate coating, and even a well-kept cell wears out after a few years.
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