An old question that was answered badly, but one that is still asked.

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Here's how it could have been answered:

1. Search Google for "Pentair + IC-20 + manual".

2. Get the Pentair manual from this page: https://pentairpool.com/en/support/m...6-d697c377c683

3. It's this one: https://pentairpool.com/~/media/webs...nsanitizer.pdf

4. On page 7, under the "Salt Level LEDs" heading, read the explanation for "Flashing Green" led indication.*

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Two more comments.

1. If you do the Google search straight-up, you get a confusing list of options. The 2nd one (at least today) is for the manual PDF, but the manual index does not appear.

HOWEVER, if you use the Super Search page (http://pool9.net/ssearch) and grab use the Pentair only search link it will create . . . the top 2 answers are the ones you want.

2. The flashing LED means too much salt.