Split by moderator from HERE to longer hijack the original thread with this tangent. jblizzle
I do this for a living I know how it works. I install about 50 a year.
It is not calculated from the performance of the cell for number 1. It has a built in tester.
The tester is made to run low so the lights come on showing a problem but it has been known for it to run fine and read salt fine but the cell is still bad. (Not generating chlorine)
Phosphates can also cease a salt water pool from generating chlorine
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