Staff Answer
Sep 01, 2026 - 06:44 AM
The 'Clean Cell' light on your Core 35 indicates that the cell may need additional cleaning. It is possible that a cell can need back-to-back cleanings to fully dissolve and remove all solids from within the cell. It is also possible if there is a high Saturation Index level (LSI) in the water chemistry that solids are building up quickly after the last cleaning (this can occur as quickly as 24 hours depending on the balance). If however you have thoroughly cleaned the cell multiple times in a row (so that when adding newly mixed cleaning solution to the cell no fizzing occurs), and the "clean cell" light turns on within a few minutes of turning back on, then you may want to open a ticket with our support team for additional troubleshooting.

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