Response to Generally, most cells have a lifespan of about 3-5 years of continuous usage (every day). Once the system no longer producing chlorine, that might indicate that your cell is bad. Unfortunately, we do not have any information from the manufacturer which would suggest there is a DIY test for making sure the cell is still good. I might reach out to Pentair directly to see if they have any advice. They can be reached at 800.831.7133

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