The pool store said it was that high, but I bought the Taylor test kit for salt and it showed 4200 twice, and that was before 1.5” rain. Also, when I set the SWG to T-3, salt level numbers are very low (1500-2000), and I get errors when l leave it for a day or two( low salt, not generating). At T-5 everything is stable. I don’t really understand the difference in operation of the SWG with those two settings, especially the salt readings.