Hayward/Goldline T-15 Cell, just shy of 10 years. I wouldn't buy anything else.

But pool water chemistry and maintenance of the cell is critical to a long cell life. Most often it is poor chemistry and aggressive cell cleaning that shortens the life of the cell.

Did you find a lot of scale on your cell when you inspected it?

Did you frequently have to use acid to clean the cell?

Did you track CSI as part of your chemistry management?

What were the symptoms of the failing cell?