Staff Answer
Sep 14, 2026 - 12:58 PM
For most salt systems historically, the "salinity sensor" is the cell itself (the titanium plates inside). The control box on the wall measures how hard it is to send power through the cell - as salinity drops, it gets harder to send power, so the system displays a lower salinity reading. This is why most salt system user manual instructions say to always independently measure the pool water before adding any salt, and why some salt system models might interchangeably say to clean the cell or display low salt readings depending on a combination of factors.
Some newer salt system models will have an independent secondary conductivity sensor away from the cell's titanium plates. This lets the system distinguish between actual low salt levels and mineral scaling that builds up inside a cell. In this case, the salinity sensor may be on one end of the cell and slightly separated from the titanium plates, or sometimes the salinity sensor is in a separate component like a "tri-sensor" or flow switch assembly.
For your precise model, checking its product manual would be a good start (manuals for many models are listed on our product support page). We're also happy to provide additional help if you contact our support team.
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